Build: Add Arm v8.1m arch PSA API test support

Signed-off-by: Dávid Házi <david.hazi@arm.com>
Change-Id: I8cc8cdfcfbe13733aadedc1fed3039cc8995e7e8
diff --git a/app/CMakeLists.txt b/app/CMakeLists.txt
index d71ad6f..9b853cd 100755
--- a/app/CMakeLists.txt
+++ b/app/CMakeLists.txt
@@ -174,6 +174,8 @@
             set(CPU_ARCH armv8m_ml)
         elseif (${TFM_SYSTEM_ARCHITECTURE} STREQUAL armv8-m.base)
             set(CPU_ARCH armv8m_bl)
+        elseif (${TFM_SYSTEM_ARCHITECTURE} STREQUAL armv8.1-m.main)
+            set(CPU_ARCH armv81m_ml)
         elseif (${TFM_SYSTEM_ARCHITECTURE} STREQUAL armv7-m)
             set(CPU_ARCH armv7m)
         endif()