Revert "system.prop: set ro.bq.gpu_to_cpu_unsupported for crespo"

This appears to work just fine on S5PC110, so we don't need to disable
that code path in the screenshot code.

This reverts commit f878d8e7af69e8f368961a2cb4dbe8f1fe86ed56.
fstab.herring: fix media storage encryption

The old vold "encryptable" flag appears to correspond to
encryptable=footer in the unified fstab (the location of the key now has
to be specified explicitly).