Show error state when fingerprint read times out

If we are unable to read the user's fingerprint after the allotted
time, switch to the error state.  If we get 5 consecutive errors
we will prompt the user to try the enrollment process again.

Change-Id: Iad291d3e997414842f061b8eee50d3846fb0b8a0

Conflicts:
	res/values/cm_strings.xml