Can't back this up unless we start selectively excluding apps, which is gross.
Most apps only store interstitial files here, so it is not a huge deal.
Apps need to be able to work properly without an SD card. (Oops ROM Manager).
Revert "backup and restore of /sdcard/Android (see getExternalFilesDir)"
This reverts commit 50732e3c67.
Conflicts:
Android.mk
Change-Id: I3978c5521b4f29c4d709c3bb6a8fa7e53678a79e
