selinux: Label misc block device.

Suppress the following warnings when calling uncrypt.

avc: granted { write } for name="mmcblk0p23" dev="tmpfs" ino=10885 scontext=u:r:uncrypt:s0 tcontext=u:object_r:block_device:s0 tclass=blk_file
avc: granted { write open } for path="/dev/block/mmcblk0p23" dev="tmpfs" ino=10885 scontext=u:r:uncrypt:s0 tcontext=u:object_r:block_device:s0 tclass=blk_file

Bug: 25091603
Change-Id: Ib41a144e69d9b234ab88875734b28bc85e17a7ad
1 file changed