Revert "Add f2fs support"

This reverts commit bd11f08835c3bb824b77cba395af6ed395e641bf.
Remove f2fs support
Revert "leds: At disable, set the trigger to default instead of wiping it"

This reverts commit bc1cb9a3dd8c198d20c3e0c2583581659cd83bee.
Revert "hammerhead kernel: implement always on rgb led support"

This reverts commit 6ffd3fdb5bf4ea647d0cc3eb2814a99b3f7c039c.