Revert "kfdtest.exclude: Temporarily blacklist IPC on gfx900"

This reverts commit d00ec779ce.

Fixes for HMM change corner cases are merged in from drm-next.
Tests are passed on gfx900 with the latest amd-kfd-staging.

Change-Id: I6c00d1eacf6b3f1ce715e085ae622b4e9ff1b7ff
Signed-off-by: Philip Yang <Philip.Yang@amd.com>

tests/kfdtest/scripts/kfdtest.exclude

@@ -125,10 +125,8 @@ LEXA_TESTS_BLACKLIST=\
 "$SDMA_BLACKLIST"
 
 # KFDDBG.BasicAddressWatch is not supported on GFXv9 and later. FIXME: it should disable itself
-# KFDIPCTest is temporarily blacklisted due to recent HMM changes. Philip Yang is investigating
 VEGA10_TESTS_BLACKLIST=\
 "$BLACKLIST_ALL_ASICS:"\
-"KFDIPCTest.*:"\
 "KFDDBGTest.BasicAddressWatch"
 
 VEGA12_TESTS_BLACKLIST=\