ls990: add liblgderp and missing bt firmware

Change-Id: I17f7e050ee483500c9d1b9215c18a5405f0f7047
fstab: fix external sdcard location

Change-Id: Iaa93d204304b04fe9f5719ba871cd60736aef50b
Merge "ls990: add liblgderp and missing bt firmware" into cm-12.0