ARM: defconfig: drop CONFIG_DRM_RCAR_LVDS

commit 1441a15d upstream.

This is now a hidden symbol, so just drop the defconfig line.

Fixes: 42d95d1b ("drm/rcar: stop using 'imply' for dependencies")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>