drm/radeon/ni_dma: Move 'cayman_gpu_check_soft_reset()'s prototype to shared header

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

drivers/gpu/drm/radeon/ni.c:1733:5: warning: no previous prototype for ‘cayman_gpu_check_soft_reset’ [-Wmissing-prototypes]
1733 | u32 cayman_gpu_check_soft_reset(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>

drm/radeon/evergreen: Move 'cayman_*()'s prototypes to shared header

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

drivers/gpu/drm/radeon/ni.c:1378:6: warning: no previous prototype for ‘cayman_cp_int_cntl_setup’ [-Wmissing-prototypes]
1378 | void cayman_cp_int_cntl_setup(struct radeon_device *rdev,
| ^~~~~~~~~~~~~~~~~~~~~~~~
drivers/gpu/drm/radeon/ni.c:1732:5: warning: no previous prototype for ‘cayman_gpu_check_soft_reset’ [-Wmissing-prototypes]
1732 | u32 cayman_gpu_check_soft_reset(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>