media: atomisp: drop unused ATOMISP_MAP_FLAG_* flags

Drop the ATOMISP_MAP_FLAG_CACHED flag, it is never set anywhere;
also drop the matching "cached" parameter to hmm[_bo]_alloc which
value was derived form the never set flag.

Drop the ATOMISP_MAP_FLAG_NOFLUSH, it is not used anywhere.

Link: https://lore.kernel.org/linux-media/20220615205037.16549-27-hdegoede@redhat.com


Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>