Fix missing call to requestTransparentRegion()

Partial revert of a59c3a5a

Add a call back to requestTransparentRegion() in performDrawFinished()
to fix a bug where the transparent region is not set correctly for the
Activity layer in a benchmarking app.

This causes Android to use 2 composited layers are set up instead of 1.
On at least one device this causes a performance regression.

Fixes issue "ampere:3DMark Scores is too low"
PD#OTT-314

Test: lunch deadpool-userdebug; make -j50; fastboot flashall ; watch adb shell dumpsys SurfaceFlinger \| grep -A80 layers:
Bug: 122052559
Change-Id: Iff3fd6bc2ec6b7be81c43359b6e69b3b21c9cd8e
Signed-off-by: Pengfei Zhao <pengfei.zhao@amlogic.com>