Set the thread pool count to 4 for vts3 tests.
Thread priority is from
https://source.corp.google.com/android/frameworks/native/services/surfaceflinger/main_surfaceflinger.cpp;rcl=e9cdd276a89d512137f22650da0c45ee4b28bd66;l=97

Test: atest VtsHalGraphicsComposer3_TargetTest
BUG: 207005096
Change-Id: Ic37b454c4ae3990fd8cb38fcdd50747083b2528c
1 file changed