kfdtest: blacklist KFDMemoryTest.DeviceHdpFlush on gfx90a

Due to cache coherence change, the remote vram mapping is changed
to cached, the written value by remote shader will not be read by
local shader. So the test will fail.

Signed-off-by: Eric Huang <jinhuieric.huang@amd.com>
Change-Id: I2b64e8a30bed0066e159bad9bb7febae5ebe84aa

tests/kfdtest/scripts/kfdtest.exclude

@@ -196,7 +196,8 @@ FILTER[arcturus]=\
 FILTER[aldebaran]=\
 "$BLACKLIST_ALL_ASICS:"\
 "KFDExceptionTest.FaultStorm:"\
-"KFDEvictTest.BurstyTest"
+"KFDEvictTest.BurstyTest:"\
+"KFDMemoryTest.DeviceHdpFlush"
 
 FILTER[navi10]=\
 "$BLACKLIST_ALL_ASICS:"\