Camera3: Override AE state for front camera during precapture trigger

For front camera (YUV sensor), 3A doesn't run, so HAL cannot provide
metadata with regard to precapture trigger. Override the result
AE state to CONVERGED for a request with precapture trigger.

Bug: 18456128
Change-Id: Iadb9b9d8dbd26fba891337ba2bbfc928c950cb83
2 files changed