linux-4.9.68: Add CONFIG_DRM_NOUVEAU

As requested by Thomas:

* Add CONFIG_DRM_NOUVEAU=m
* Change CONFIG_DRM=y to CONFIG_DRM=m

When CONFIG_DRM_NOUVEAU ist set, CONFIG_FB_VESA is implied.

Note, that nvidia_drm.ko requires the modules drm and drm_kms_helper.
Because we select differenct nvidia modules depending on the graphics
card found at boot time, we don't have that dependency in modules.dep
and need to explicitly load the drm modules for nvidia.

linux-4.9.68-193.bee

@@ -681,13 +681,13 @@ mee_configure() {
 	CONFIG_AGP=y
 	CONFIG_AGP_AMD64=y
 	CONFIG_AGP_INTEL=m
-	CONFIG_DRM=y
+	CONFIG_DRM=m
 	CONFIG_DRM_AMDGPU=m
 	CONFIG_DRM_AMDGPU_SI=y
 	CONFIG_DRM_AMDGPU_CIK=y
 	CONFIG_DRM_AMDGPU_USERPTR=y
+	CONFIG_DRM_NOUVEAU=m
 	CONFIG_DRM_I915=m
-	CONFIG_FB_VESA=y
 	CONFIG_BACKLIGHT_CLASS_DEVICE=y
 	CONFIG_VGACON_SOFT_SCROLLBACK=y
 	CONFIG_VGACON_SOFT_SCROLLBACK_SIZE=256