media: atomisp: fix small Kconfig issues

The help text should be indented by at least two spaces after the
'help' separator. This is both good practice and the media_build system
for building media drivers makes this assumption.

Fix this for the atomisp/i2c/Kconfig and fix the atomisp/pci/Kconfig
that didn't align the help separator with the preceding keywords.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>