drm/radeon/ci_dpm: Move 'ci_*()'s prototypes to shared header

Fixes the following W=1 kernel build warning(s):

 drivers/gpu/drm/radeon/cik.c:1868:5: warning: no previous prototype for ‘ci_mc_load_microcode’ [-Wmissing-prototypes]
 1868 | int ci_mc_load_microcode(struct radeon_device *rdev)
 | ^~~~~~~~~~~~~~~~~~~~
 drivers/gpu/drm/radeon/cik.c:5847:6: warning: no previous prototype for ‘cik_enter_rlc_safe_mode’ [-Wmissing-prototypes]
 5847 | void cik_enter_rlc_safe_mode(struct radeon_device *rdev)
 | ^~~~~~~~~~~~~~~~~~~~~~~
 drivers/gpu/drm/radeon/cik.c:5868:6: warning: no previous prototype for ‘cik_exit_rlc_safe_mode’ [-Wmissing-prototypes]
 5868 | void cik_exit_rlc_safe_mode(struct radeon_device *rdev)
 | ^~~~~~~~~~~~~~~~~~~~~~
 drivers/gpu/drm/radeon/cik.c:6286:6: warning: no previous prototype for ‘cik_update_cg’ [-Wmissing-prototypes]
 6286 | void cik_update_cg(struct radeon_device *rdev,
 | ^~~~~~~~~~~~~

Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: "Christian König" <christian.koenig@amd.com>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: amd-gfx@lists.freedesktop.org
Cc: dri-devel@lists.freedesktop.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/radeon/ci_dpm.c

@@ -27,6 +27,7 @@
 
 #include "atom.h"
 #include "ci_dpm.h"
+#include "cik.h"
 #include "cikd.h"
 #include "r600_dpm.h"
 #include "radeon.h"
@@ -157,12 +158,6 @@ extern u8 si_get_mclk_frequency_ratio(u32 memory_clock, bool strobe_mode);
 extern void si_trim_voltage_table_to_fit_state_table(struct radeon_device *rdev,
 						     u32 max_voltage_steps,
 						     struct atom_voltage_table *voltage_table);
-extern void cik_enter_rlc_safe_mode(struct radeon_device *rdev);
-extern void cik_exit_rlc_safe_mode(struct radeon_device *rdev);
-extern int ci_mc_load_microcode(struct radeon_device *rdev);
-extern void cik_update_cg(struct radeon_device *rdev,
-			  u32 block, bool enable);
-
 static int ci_get_std_voltage_value_sidd(struct radeon_device *rdev,
 					 struct atom_voltage_table_entry *voltage_table,
 					 u16 *std_voltage_hi_sidd, u16 *std_voltage_lo_sidd);

drivers/gpu/drm/radeon/cik.c

@@ -32,6 +32,7 @@
 #include "atom.h"
 #include "evergreen.h"
 #include "cik_blit_shaders.h"
+#include "cik.h"
 #include "cikd.h"
 #include "clearstate_ci.h"
 #include "r600.h"

drivers/gpu/drm/radeon/cik.h

+/* cik.h -- Private header for radeon driver -*- linux-c -*-
+ * Copyright 2012 Advanced Micro Devices, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#ifndef __CIK_H__
+#define __CIK_H__
+
+struct radeon_device;
+
+void cik_enter_rlc_safe_mode(struct radeon_device *rdev);
+void cik_exit_rlc_safe_mode(struct radeon_device *rdev);
+int ci_mc_load_microcode(struct radeon_device *rdev);
+void cik_update_cg(struct radeon_device *rdev, u32 block, bool enable);
+
+#endif                         /* __CIK_H__ */