drm/amd: Use drm_*() macros instead of DRM_*() for amdgpu_cs

Some of the IOCTL messages can be called for different GPUs and it might
not be obvious which one called them from a problem.  Using the drm_*()
macros the correct device will be shown in the messages.

Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Link: https://lore.kernel.org/r/20250715212420.2254925-1-superm1@kernel.org


Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>