drm/radeon/radeon_drv: Move 'radeon_driver_irq_handler_kms's prototype into shared header

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

 drivers/gpu/drm/radeon/radeon_irq_kms.c:53:13: warning: no previous prototype for ‘radeon_driver_irq_handler_kms’ [-Wmissing-prototypes]
 53 | irqreturn_t radeon_driver_irq_handler_kms(int irq, void *arg)
 | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 drivers/gpu/drm/radeon/radeon_irq_kms.c:120:6: warning: no previous prototype for ‘radeon_driver_irq_preinstall_kms’ [-Wmissing-prototypes]
 120 | void radeon_driver_irq_preinstall_kms(struct drm_device *dev)
 | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 drivers/gpu/drm/radeon/radeon_irq_kms.c:152:5: warning: no previous prototype for ‘radeon_driver_irq_postinstall_kms’ [-Wmissing-prototypes]
 152 | int radeon_driver_irq_postinstall_kms(struct drm_device *dev)
 | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 drivers/gpu/drm/radeon/radeon_irq_kms.c:171:6: warning: no previous prototype for ‘radeon_driver_irq_uninstall_kms’ [-Wmissing-prototypes]
 171 | void radeon_driver_irq_uninstall_kms(struct drm_device *dev)
 | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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: Gareth Hughes <gareth@valinux.com>
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/radeon_drv.c

@@ -51,6 +51,7 @@
 #include <drm/radeon_drm.h>
 
 #include "radeon_drv.h"
+#include "radeon_kms.h"
 #include "radeon_ttm.h"
 #include "radeon_device.h"
 
@@ -116,10 +117,6 @@
 int radeon_suspend_kms(struct drm_device *dev, bool suspend,
 		       bool fbcon, bool freeze);
 int radeon_resume_kms(struct drm_device *dev, bool resume, bool fbcon);
-void radeon_driver_irq_preinstall_kms(struct drm_device *dev);
-int radeon_driver_irq_postinstall_kms(struct drm_device *dev);
-void radeon_driver_irq_uninstall_kms(struct drm_device *dev);
-irqreturn_t radeon_driver_irq_handler_kms(int irq, void *arg);
 extern int radeon_get_crtc_scanoutpos(struct drm_device *dev, unsigned int crtc,
 				      unsigned int flags, int *vpos, int *hpos,
 				      ktime_t *stime, ktime_t *etime,

drivers/gpu/drm/radeon/radeon_irq_kms.c

@@ -38,6 +38,7 @@
 
 #include "atom.h"
 #include "radeon.h"
+#include "radeon_kms.h"
 #include "radeon_reg.h"
 
 

drivers/gpu/drm/radeon/radeon_kms.h

@@ -31,5 +31,9 @@
 u32 radeon_get_vblank_counter_kms(struct drm_crtc *crtc);
 int radeon_enable_vblank_kms(struct drm_crtc *crtc);
 void radeon_disable_vblank_kms(struct drm_crtc *crtc);
+irqreturn_t radeon_driver_irq_handler_kms(int irq, void *arg);
+void radeon_driver_irq_preinstall_kms(struct drm_device *dev);
+int radeon_driver_irq_postinstall_kms(struct drm_device *dev);
+void radeon_driver_irq_uninstall_kms(struct drm_device *dev);
 
 #endif				/* __RADEON_KMS_H__ */