staging: media: VIDEO_STARFIVE_CAMSS should depend on ARCH_STARFIVE

The StarFive Camera Subsystem is only present on the StarFive JH7110
SoC.  Hence add a dependency on ARCH_STARFIVE, to prevent asking the
user about this driver when configuring a kernel without StarFive SoC
support.

Fixes: bba185d1 ("media: staging: media: starfive: camss: Add core driver")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Changhuang Liang <changhuang.liang@starfivetech.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>