HolePunchPIP: Do not use hole punch for HDR videos

Fixes: 190210946
Test: libcompositionengine_test

When mixing HDR and SDR content, we need to use client composition to
apply the appropriate gamma scaling and dithering. Skip using the hole
punch, which is used to support device composition + rounded corners.

Change-Id: Ib27063fb1b53bbd8c37381c1a10f020425686035