coreos-modules: Disable DRM_FBDEV_EMULATION

The out-of-tree nvidia driver requires symbols that are behind DRM_TTM_HELPER
if DRM_FBDEV_EMULATION is enabled, but DRM_TTM_HELPER can't be selected unless
we build more drm drivers (which is undesirable). To get out of this, disable
DRM_FBDEV_EMULATION.

Signed-off-by: Jeremi Piotrowski <jpiotrowski@microsoft.com>

Author: jepio

sdk_container/src/third_party/coreos-overlay/sys-kernel/coreos-modules/files/commonconfig-6.12

@@ -171,6 +171,7 @@ CONFIG_DNS_RESOLVER=y
 CONFIG_DRM=m
 CONFIG_DRM_VIRTIO_GPU=m
 CONFIG_DST_CACHE=y
+# CONFIG_DRM_FBDEV_EMULATION is not set
 CONFIG_DUMMY=m
 CONFIG_DYNAMIC_DEBUG=y
 CONFIG_E100=m