tc: Support building TF-A on TC4 platform

This includes SCP build test on TC4 platform.

Change-Id: I8560a2083c6bf57dd71d78058b361d714c8125d8
Signed-off-by: Leo Yan <leo.yan@arm.com>
diff --git a/script/tf-coverity/tf-cov-make b/script/tf-coverity/tf-cov-make
index 7cb46c7..977b25a 100755
--- a/script/tf-coverity/tf-cov-make
+++ b/script/tf-coverity/tf-cov-make
@@ -360,6 +360,8 @@
 clean_build $(common_flags) PLAT=tc TARGET_PLATFORM=3 ${ARM_TBB_OPTIONS} PLATFORM_TEST=rse-nv-counters
 clean_build $(common_flags) PLAT=tc TARGET_PLATFORM=3 ${ARM_TBB_OPTIONS} PLATFORM_TEST=tfm-testsuite \
     TF_M_TESTS_PATH=$(pwd)/../tf-m-tests TF_M_EXTRAS_PATH=$(pwd)/../tf-m-extras
+clean_build $(common_flags) PLAT=tc TARGET_PLATFORM=4 ${ARM_TBB_OPTIONS} \
+    PLAT_MHU_VERSION=3
 
 #
 # Morello platform