hwc: Configure MDP with updated crop and whf for PTOR layers

1. For PTOR layers, MDP needs to be configured with width, height
and format of the Copybit render buffer, otherwise it will lead to
artifacts due to incorrect render buffer reads, when PTOR layer
handles have un-equal strides.

2. Remove render buffer offset for a PTOR layer and configure MDP
with modified source crop, based on its position on render buffer.

3. A layer cannot qualify for PTOR feature, if none of below layers
intersect with it.

Change-Id: Idba65789b9ed3b699a5c70107881868c0385322d
Merge "hwc: Configure MDP with updated crop and whf for PTOR layers" into kitkat