[media] atomisp: fix coding style warnings

Fix for warnings reported by checkpatch.pl:
 - Multiline comment style
 - Bare "unsigned"
 - Missing blank line after declarations
 - Un-needed braces around single-statement branch

Signed-off-by: Avraham Shukron <avraham.shukron@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>