Allow execmem and ashmem_device execute as required.

bootanim requires execmem.
bootanim and surfaceflinger requires execute to ashmem_device.

Change-Id: I3b4964c5acd31a44ce81672077c70353a375c072
Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
Merge "Allow execmem and ashmem_device execute as required."
Merge branch 'master' of https://android.googlesource.com/platform/build into wip