Preliminary raspberrypi support 3.11.y

Signed-off-by: David Sterba <dsterba@suse.cz>
Add raspberrypi patch for 3.11.6

Signed-off-by: David Sterba <dsterba@suse.cz>
Refresh raspberrypi patch

Signed-off-by: David Sterba <dsterba@suse.cz>
Compile btrfs into kernel

Needed for root fs.

Signed-off-by: David Sterba <dsterba@suse.cz>