Remove emulator files

Change-Id: I34888be2b0ce5b61c14f9291f507b213a1e1a1ab
Don't install RFS modules (but keep in repository)

It's no longer used for recovery or Android boot, so let's save some
space in the ramdisk.

Change-Id: I6af4364c5c77b1ac177aa77f623afc22b6310edb