Add missing syscalls for memfd usage

Mediaextractor uses libcutils to allocate shared memory buffers.
Libcutils can use either the ashmem driver or memfd for allocating
memory, so add support for mediaextractor to use memfd via libcutils.

Bug: 409097987
Bug: 111903542
Flag: EXEMPT bugfix
Change-Id: I128178e0242e8ee9923b247e8324cb42a0ec2b51
Signed-off-by: Isaac J. Manjarres <isaacmanjarres@google.com>