drm/radeon/cik: Move 'r600_ih_ring_{alloc, fini}()'s prototypes to shared header

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

 drivers/gpu/drm/radeon/r600.c:3480:5: warning: no previous prototype for ‘r600_ih_ring_alloc’ [-Wmissing-prototypes]
 3480 | int r600_ih_ring_alloc(struct radeon_device *rdev)
 | ^~~~~~~~~~~~~~~~~~
 drivers/gpu/drm/radeon/r600.c:3516:6: warning: no previous prototype for ‘r600_ih_ring_fini’ [-Wmissing-prototypes]
 3516 | void r600_ih_ring_fini(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: Sumit Semwal <sumit.semwal@linaro.org>
Cc: amd-gfx@lists.freedesktop.org
Cc: dri-devel@lists.freedesktop.org
Cc: linux-media@vger.kernel.org
Cc: linaro-mm-sig@lists.linaro.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/radeon/cik.c

@@ -34,6 +34,7 @@
 #include "cik_blit_shaders.h"
 #include "cikd.h"
 #include "clearstate_ci.h"
+#include "r600.h"
 #include "radeon.h"
 #include "radeon_asic.h"
 #include "radeon_audio.h"
@@ -125,8 +126,6 @@ MODULE_FIRMWARE("radeon/mullins_mec.bin");
 MODULE_FIRMWARE("radeon/mullins_rlc.bin");
 MODULE_FIRMWARE("radeon/mullins_sdma.bin");
 
-extern int r600_ih_ring_alloc(struct radeon_device *rdev);
-extern void r600_ih_ring_fini(struct radeon_device *rdev);
 extern void si_vram_gtt_location(struct radeon_device *rdev, struct radeon_mc *mc);
 extern void si_rlc_reset(struct radeon_device *rdev);
 extern void si_init_uvd_internal_cg(struct radeon_device *rdev);

drivers/gpu/drm/radeon/r600.h

@@ -31,5 +31,7 @@
 struct radeon_device;
 
 u32 r600_gpu_check_soft_reset(struct radeon_device *rdev);
+int r600_ih_ring_alloc(struct radeon_device *rdev);
+void r600_ih_ring_fini(struct radeon_device *rdev);
 
 #endif				/* __R600_H__ */

drivers/gpu/drm/radeon/si.c

@@ -33,6 +33,7 @@
 #include "atom.h"
 #include "clearstate_si.h"
 #include "evergreen.h"
+#include "r600.h"
 #include "radeon.h"
 #include "radeon_asic.h"
 #include "radeon_audio.h"
@@ -128,8 +129,6 @@ static void si_pcie_gen3_enable(struct radeon_device *rdev);
 static void si_program_aspm(struct radeon_device *rdev);
 extern void sumo_rlc_fini(struct radeon_device *rdev);
 extern int sumo_rlc_init(struct radeon_device *rdev);
-extern int r600_ih_ring_alloc(struct radeon_device *rdev);
-extern void r600_ih_ring_fini(struct radeon_device *rdev);
 static void si_enable_gui_idle_interrupt(struct radeon_device *rdev,
 					 bool enable);
 static void si_init_pg(struct radeon_device *rdev);