libhwc2.1: WAR: handle setColorTransform() calls

To make DP mirroring work, need to implement a stub function:
ExynosExternalDisplay::setColorTransform()

This is a temporary workaround until proper fix has been implemented.

Bug: 238372891
Change-Id: Idb51fd4ed49ad0006feb82cd5ee971c72b2264cf
1 file changed