media: atomisp: drop ATOMISP_MAP_FLAG_CONTIGUOUS

Drop the ATOMISP_MAP_FLAG_CONTIGUOUS hmm_alloc flag. After the contiguous
flag removal done in previous patches in this series it is never set.

And hmm_alloc already did a WARN_ON on the flag and otherwise ignored it,
proving that contiguous support was already never used.

Link: https://lore.kernel.org/linux-media/20220615205037.16549-9-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>