MLECO-2853: update cmake flags for Armclang

* set CMP0123 policy to remove warning
* remove parentheses to avoid assert is always true warning

Change-Id: Ifcdf089183d750d7b00b345f5c4115c82d897def
diff --git a/CMakeLists.txt b/CMakeLists.txt
index e61e378..7dccd75 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -74,6 +74,10 @@
 assert_defined(CPU_PROFILE_ENABLED)
 assert_defined(CMAKE_TOOLCHAIN_FILE)
 
+if(POLICY CMP0123)
+    cmake_policy(SET CMP0123 NEW)
+endif()
+
 project(arm_ml_embedded_evaluation_kit
         VERSION     21.11.1
         DESCRIPTION "ARM ML Embedded Evaluation Kit"