Disable loading of RFS/J4FS modules

We have no further use for RFS, and J4FS can be manually insmodded
if needed.

Change-Id: Icc8a9592a78c60033ad5afc067fd90660c7e9896
Set system:graphics perms for cache-ops and gememalloc

Change-Id: I2c3d63aef03bab54f05fa89cba451bce133ca918