Fix translucent navigation bar layout on tablets in landscape.

The status bar blocker view was visible and stretched over the whole
navigation bar, even though it's not even needed on tablets, as the
status bar never extends into the navigation bar there. Fix that by
hiding the blocker view, but keep it in the layout in oder to not
clutter the code with null checks.

Also cleanup unneeded method override.

Change-Id: I50d58e6e3496516b37f8c36b497cf8c9f569325c
AppOps: Add nfc enable control into AppOps

Check user permission before enabling nfc.

Change-Id: Ia84e33c299e4fdecfd66ee933d9e7d37ed29c340
AppOps: add permission check when enabing nfc

Add appops permission check for enable function.

Change-Id: Ie98be3e7b3cd9e72b0ad12cc1634d9cd1869a66c
ProximitySensor: check for correct MaxRange value

Use TYPICAL_PROXIMITY_THRESHOLD for devices that returns incorrect mProximitySensor.getMaximumRange() value;

Presto's proximity sensor returns values: 0.0f(near) or 5.0f(far).
mProximitySensor.getMaximumRange() must return proximity sensor's availible range, but it always return 0, so mProximityThreshold is also 0.

So boolean positive = distance >= 0.0f && distance < mProximityThreshold;  positive will never be
true.
The cause of this problem is proprietary sensor.msm8660.so, it must set proper Range and Resolution for proximity sensor.

Change-Id: I0cf81fd20f210115cbd6db10c0070b12f1c57336