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

Because CONFIG_DRM_NOUVEAU activates CONFIG_FB, we make that
a module, too.

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 dependeny in
modules.dep and need to explicitly load the drm modules for nvidia.

linux-4.9.68-193.bee

@@ -681,12 +681,14 @@ 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=m
 	CONFIG_FB_VESA=y
 	CONFIG_BACKLIGHT_CLASS_DEVICE=y
 	CONFIG_VGACON_SOFT_SCROLLBACK=y