Reland "sepolicy: fix zygote JIT permissions w.r.t. ashmem"

zygote now allocates JIT memory using libcutils API (aosp/1135101)
instead of going to /dev/ashmem directly, which requires execute
permissions to ashmem_libcutils_device.

Bug: 134434505
Change-Id: I3b5eeac1ec06d8d70da327743174ca83eec6b41c
Test: boot crosshatch
1 file changed