drm: Remove DRM_ARRAY_SIZE() for ARRAY_SIZE()

I cannot see a need to provide a DRM_ version of ARRAY_SIZE(), only used
in a few places. I suspect its usage has been spread by copy & paste
rather than anything else.

Let's just remove it for plain ARRAY_SIZE().

Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

drivers/gpu/drm/nouveau/nouveau_ioc32.c

@@ -57,7 +57,7 @@ long nouveau_compat_ioctl(struct file *filp, unsigned int cmd,
 		return drm_compat_ioctl(filp, cmd, arg);
 
 #if 0
-	if (nr < DRM_COMMAND_BASE + DRM_ARRAY_SIZE(mga_compat_ioctls))
+	if (nr < DRM_COMMAND_BASE + ARRAY_SIZE(mga_compat_ioctls))
 		fn = nouveau_compat_ioctls[nr - DRM_COMMAND_BASE];
 #endif
 	if (fn != NULL)