KeyStore: allow system user to get secrets from keystore.
KeyStore: allow system user to get secrets from keystore.

Change-Id: I9cb41344c17fb33e6614a45d46368a9c43e3dce7

xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base