Decrypt super-encrypted keys

This fixes a bug introduce in ag/2108644.  That CL added automatic
super-encryption of authentication-bound keys, but missed the necessary
change to decrypt them when needed.

Test: Manually tested
Change-Id: I84693b145a6d57d5957aa40d10236e1a0610d12c
1 file changed
tree: 422363e86dd26b4c997bbdfe7833a2544480f9e1
  1. keystore/
  2. keystore-engine/
  3. softkeymaster/
  4. MODULE_LICENSE_APACHE2
  5. NOTICE