nvidiactl: Load drm modules

We are going to change the kernel DRM modules from static to dynamic.
nvidia_drm.ko requires drm and drm_kms_helper. If theses are dynamic
modules, probe them before we load the nvida modules.

nvidiactl/nvidiactl

@@ -48,6 +48,10 @@ nvver=$(readlink ${leglink})
 
 rm -f /node/usr_share_mxgfx
 ln -sf /usr/share/nvidia/${nvver} /node/usr_share_mxgfx
+
+test -e /lib/modules/$kver/kernel/drivers/gpu/drm/drm.ko && modprobe drm
+test -e /lib/modules/$kver/kernel/drivers/gpu/drm/drm_kms_helper.ko && modprobe drm_kms_helper
+
 insmod ${leglink}/nvidia.ko
 
 # Count the number of NVIDIA controllers found.