ARM: shmobile: defconfig: Enable RZ/A1 CEU support

Enable support for the RZ/A1H Capture Engine Unit, which is used on the
GR-Peach audiocamera shield expansion board.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20200624131931.3686-6-geert+renesas@glider.be