update safestrap prebuilts

Change-Id: I2b7d30e1c64a8bcc3f0e67a453f8c4d02a354fb2
add default fstab for umts

Change-Id: I0db127762cbe0fdc7270ab9547babad0b3df94e4
Merge "update safestrap prebuilts" into cm-10.2
Merge "add default fstab for umts" into cm-10.2