remove unused webgl flag

Change-Id: I79b8f17b31fc9d584292ac9bfa732f4e0d4b8153
recovery: workaround issues with xattrs

Don't use set_metadata in updater-script until
recovery has been updated.

Change-Id: I5dbef6ad3871ab2c495a4ae28f62e41524252607
update readme

Change-Id: Id4c96983b8d724119ee522403f97ff4d84ef4922