sdm: Wrap DISPLAY_TERTIARY around QTI_BSP

1. HWC_DISPLAY_TERTIARY is not defined in AOSP. Wrap DISPLAY_TERTIARY around
QTI_BSP.

2. Include common.mk for hwc make file.

CRs-Fixed: 966190

Change-Id: I7f68feeb6fb94fb4dd77e3c21be9c563925bc200
2 files changed