d852: update bt config

Change-Id: If449acee9d6cd15249df6f413b4d2cd80b8910f6
d852: update fstab

* add recoveryonly to boot and recovery partitions
* update deprecated prefix on usb/externalsd
* set auto for usb/externalsd filesystem

Change-Id: I9dfca66f45b6c51f0c6c8d11ca812490457e42ec
wifi: include hostapd_default.conf

Change-Id: If317d41de20b3e96307c826cf9e32feed30f1349