Bumped version of PI in P4 tools to fix counter read bug

Change-Id: I21ad0930485b5756b6bf148d6a8693525b53b6f7
diff --git a/tools/dev/bin/onos-setup-p4-dev b/tools/dev/bin/onos-setup-p4-dev
index b4638d4..56eb6d3 100755
--- a/tools/dev/bin/onos-setup-p4-dev
+++ b/tools/dev/bin/onos-setup-p4-dev
@@ -16,7 +16,7 @@
 
 BUILD_DIR=~/p4tools
 BMV2_COMMIT="1683392d8859907b8367cc0188d3d4ed8bea268c"
-PI_COMMIT="b7053f7ad32eb8cddab2ed1f4a7e1e6a30fc5e57"
+PI_COMMIT="6b47641344c2b0bc77e51876517b98eda51eda45"
 P4C_COMMIT="55067fd0e5f9e25fef06e58e49033da3493f796d"
 PROTOBUF_COMMIT="tags/v3.0.2"
 GRPC_COMMIT="tags/v1.3.0"