Add new directory tir/contrib/ethosu to cmake build

Change-Id: I3e9f24adfe992ace4e03238a18a8378b03257e1a

Author: lhutton1

cmake/modules/contrib/EthosU.cmake

@@ -19,7 +19,8 @@ if(USE_ETHOSU)
   tvm_file_glob(GLOB COMPILER_ETHOSU_SRCS
                 src/relay/backend/contrib/ethosu/*
                 src/contrib/ethosu/cascader/*
-                src/contrib/ethosu/cascader/parts/*)
+                src/contrib/ethosu/cascader/parts/*
+                src/tir/contrib/ethosu/*)
   list(APPEND COMPILER_SRCS ${COMPILER_ETHOSU_SRCS})
 else()
   # Keeping just utils.cc because it has Object definitions