ARM: shmobile: defconfig: Enable CONFIG_VIDEO_ADV7604

The adv7612 is used on Gen2 boards (Lager, Koelsch and Gose) for HDMI
input. Enable support for this chip in shmobile_defconfig.

Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>