coverity: mediatek mt8189 platform build

Change-Id: Icc1d31071507b93581ff438469b8d56e547413b4
Signed-off-by: Gavin Liu <gavin.liu@mediatek.com>
diff --git a/script/tf-coverity/tf-cov-make b/script/tf-coverity/tf-cov-make
index 377dbb5..ef1280d 100755
--- a/script/tf-coverity/tf-cov-make
+++ b/script/tf-coverity/tf-cov-make
@@ -434,6 +434,7 @@
 make PLAT=mt8183 $(common_flags) all
 make PLAT=mt8186 $(common_flags) COREBOOT=1 all
 make PLAT=mt8188 $(common_flags) COREBOOT=1 all
+make PLAT=mt8189 $(common_flags) COREBOOT=1 all
 make PLAT=mt8192 $(common_flags) COREBOOT=1 all
 make PLAT=mt8195 $(common_flags) COREBOOT=1 all
 make PLAT=mt8196 $(common_flags) COREBOOT=1 all