support for /data on sdcard-partition

Conflicts:
	device.mk
	overlay/frameworks/base/core/res/res/values/config.xml
	overlay/frameworks/base/core/res/res/xml/storage_list.xml
	ramdisk/endeavoru_mounthelper.sh
use fstab mount for ext4 or vfat sdcards
this also unbreaks encrypted /data support

Conflicts:
	device.mk
go back to old fstab path
this is needed as stupid vold has its own hardcoded fstab path
fix permissions
use readlink to guess the fstype