cm: Create cgroup mount point for BFQ

The global init.rc no longer creates this for us in N,
but we still need it for BFQ cgroups.

Thus, create the mount point in the CM vendor init.rc.

Change-Id: Ice5ff15737329aefd1dad2401bb530a18008fc4d

prebuilt/common/etc/init.local.rc

@@ -3,6 +3,9 @@ on init
     export ANDROID_CACHE /cache
     export TERMINFO /system/etc/terminfo
 
+    # Create cgroup mount point for BFQ
+    mount tmpfs none /sys/fs/cgroup mode=0750,uid=0,gid=1000
+
     # Set up the BFQIO hierarchy
     chmod 0755 /sys/fs/cgroup
     mkdir /sys/fs/cgroup/bfqio 0755 root system