MLECO-2512: Minor improvement for helper scripts.

Python scripts 'build_default.py' and 'set_up_default_resources.py'
now allow building for non-default Ethos-U configurations: H32, H64,
H256 and Y512.

Change-Id: Iefdbf135410396c4dc0be73462644725d4b47910
diff --git a/scripts/cmake/toolchains/bare-metal-armclang.cmake b/scripts/cmake/toolchains/bare-metal-armclang.cmake
index d07aa9e..c1f066b 100644
--- a/scripts/cmake/toolchains/bare-metal-armclang.cmake
+++ b/scripts/cmake/toolchains/bare-metal-armclang.cmake
@@ -43,7 +43,7 @@
     set(FLOAT_ABI                   hard)
     set(ARM_MATH_DSP                1)
     set(ARM_MATH_LOOPUNROLL         1)
-    set(CPU_LINK_OPT                "--cpu=8.1-M.Main.dsp")
+    set(CPU_LINK_OPT                "--cpu=Cortex-M55")
 elseif(CMAKE_SYSTEM_PROCESSOR STREQUAL cortex-m33)
     # Flags for cortex-m33 to go here
 endif()