ARM: shmobile: defconfig: Remove SOC_CAMERA

As the soc_camera framework is going to be deprecated soon, remove the
associated configuration options from shmobile defconfig.

Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>