vold: Support for moving crypto metadata

 * We have a situation where we need to move the crypto metadata
   from a partition footer to a new place. Add support for this.

Change-Id: I5ccc312f7f062d8a8215530957da9c6283ed7ca5
Merge branch 'cm' into HEAD

Signed-off-by: DHOMD <DHO@dho.im>

Conflicts:
	Android.mk

Change-Id: Ic6016b98836247a7164cf2b3c143fdea000a610a