Manual merge of Ida6a4cdd3abcbcab7e2fe8450a25c0dc36765f04

Fix 2572446: Also watch keyboard changes in PIN/Password unlock.

The PIN/Password unlock screen was monitoring orientation changes.
However, while docked, this isn't useful since orientation remains
fixed. This change makes PasswordUnlockScreen also looks for
changes to config.hardKeyboardHidden.

Tested:
WVGA device while docked and opening/closing the keyboard.

Change-Id: Iaadb277028f2dd1f85fd0f627a686a86ac51a2ed