feat(intel): add build config and variant for Agilex5

Add build config and variant for Intel Agilex5 platforms.

Signed-off-by: Sieu Mun Tang <sieu.mun.tang@intel.com>
Change-Id: I85fb7eb60d493a95d9a36bba06cbaebf74f9d963
diff --git a/script/tf-coverity/tf-cov-make b/script/tf-coverity/tf-cov-make
index 9798fb3..6d4bed4 100755
--- a/script/tf-coverity/tf-cov-make
+++ b/script/tf-coverity/tf-cov-make
@@ -488,6 +488,7 @@
 # Platforms from Intel
 make PLAT=stratix10 $(common_flags) all
 make PLAT=agilex $(common_flags) all
+make PLAT=agilex5 $(common_flags) all
 make PLAT=n5x $(common_flags) all
 
 # Platforms from Broadcom