blue: Fix sdcard permissions interoperability

The current setup causes users to have to deal with
three storage configurations in play:
Sony stock (2800.2800 on sdcard)
CM10 (1023.1023 on sdcard)
CM10.1 (1023.1023 plus "new" multiuser layout)

While the multiuser layout in 4.2 forces a compatibility
break, it is better for us and users if there are only
two storage configurations in use:  pre-4.2 and post-4.2

This makes the internal SD card match Sony stock permissions
for nandroid interoperability with no negative impact to us.

Change-Id: I79e3c859a3c69374d11d2a1070ae8161e5227066
Merge "blue: Fix sdcard permissions interoperability" into jellybean