libhwc2.1: Use inherrited class for drm interface

This patch uses blow classes instead of ExynosDisplayDrmInterface.
ExynosPrimaryDisplayDrmInterfaceModule
ExynosExternalDisplayDrmInterfaceModule
Those classes can be implemented differently
depending on the display and chipset.

Bug: 154275156

Change-Id: I08d175472655481bd1145b75c1df543d8318e327
Signed-off-by: HyunKyung Kim <hk310.kim@samsung.com>
4 files changed