Don't show keyguard on top of CryptKeeper

The fix in Change Ifbe4cdf40e3b76d2069ecace940f85fa58f31187 causes
keyguard to be more aggressive about showing itself.

CryptKeeper itself should explicitly dismiss keyguard.

Fixes bug 11680832

Change-Id: I87287762b73bdffc6f1800379f02f70f4bd873a8
1 file changed