SWDEV-442719 - Set CMP0074 to NEW to make sure find_package works correctly

If a system has LLVM installed, `find_package` could choose that one
even if we set `HIP_LLVM_ROOT`. `LLVM_ROOT` is ignored because of this
CMake policy is set to `OLD` by default.

Change-Id: I18fa0453afe170c229e92d6ddc386b43eb0c44f6

hipamd/src/CMakeLists.txt

@@ -20,6 +20,10 @@
 
 cmake_minimum_required(VERSION 3.5.1)
 
+if (POLICY CMP0074)
+  cmake_policy(SET CMP0074 NEW)
+endif()
+
 include(GNUInstallDirs)
 
 set(VERSION_MAJOR_AMDHIP ${HIP_VERSION_MAJOR})

hipamd/src/hiprtc/CMakeLists.txt

@@ -27,6 +27,10 @@
 cmake_minimum_required(VERSION 3.16.1)
 option(BUILD_SHARED_LIBS "Build the shared library" ON)
 
+if (POLICY CMP0074)
+  cmake_policy(SET CMP0074 NEW)
+endif()
+
 list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_LIST_DIR}/cmake")
 
 if(BUILD_SHARED_LIBS)