media: atomisp: drop ATOMISP_MAP_FLAG_CLEARED

This flag is only used by one hmm_alloc() caller, drop it and make
the caller call hmm_set(ptr, 0, size) itself to do the clearing.

Link: https://lore.kernel.org/linux-media/20220615205037.16549-26-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>