Allow write access to ashmem allocated regions

Allow tmpfs_domains the ability to write to ashmem allocated
regions. At least one Google internal app does this, and switching
untrusted_app into enforcing causes the following denial:

<5>[  291.791423] type=1400 audit(1385587240.320:79): avc:  denied  { write } for  pid=3774 comm="XXXXXXXXXXXX" path=2F6465762F6173686D656D202864656C6574656429 dev="tmpfs" ino=16937 scontext=u:r:untrusted_app:s0 tcontext=u:object_r:untrusted_app_tmpfs:s0 tclass=file

path=/dev/ashmem (deleted)

Bug: 11891764

(cherry picked from commit 47685535)

Change-Id: I1b8fcb82b7d21291707f18364486beb2fa9eb332