MLECO-3225: Using official support for Arm Cortex-M85 CPU.

 * CMake version requirement bumped up to 3.21.0
   * CMake 3.22.4 installed in the local Python virtualenv
 * CPU flags updated in toolchain files.
 * Using __ARM_FEATURE_DSP instead of potentially defining
   ARM_MATH_DSP wrongly.
 * CMake project version bumped up to 22.05.0

Changes also made for MLECO-3107 (pack generation):

 * TensorFlow Lite Micro CMSIS-pack version updated to
   1.22.02.
 * Change to using __ARM_FEATURE_DSP will also help the
   generated pack.

Partial changes for MLECO-3095:

 * CMSIS updated to version post 5.9.0
 * TensorFlow Lite Micro updated to latest available
 * Ethos-U driver and core-platform repositories updated
   to 20.05_rc2 tags.

Change-Id: I012c9e65897aed8ce589cff9bfe3a19efc3edeb9
Signed-off-by: Kshitij Sisodia <kshitij.sisodia@arm.com>
diff --git a/source/hal/CMakeLists.txt b/source/hal/CMakeLists.txt
index b8c115c..018e970 100644
--- a/source/hal/CMakeLists.txt
+++ b/source/hal/CMakeLists.txt
@@ -19,7 +19,7 @@
 #                       HAL library                     #
 #########################################################
 
-cmake_minimum_required(VERSION 3.16.3)
+cmake_minimum_required(VERSION 3.21.0)
 
 set(HAL_TARGET hal)
 project(${HAL_TARGET}
@@ -67,5 +67,4 @@
 message(STATUS "*******************************************************")
 message(STATUS "Library                                : " ${HAL_TARGET})
 message(STATUS "CMAKE_SYSTEM_PROCESSOR                 : " ${CMAKE_SYSTEM_PROCESSOR})
-message(STATUS "CMAKE_SYSTEM_ARCH                      : " ${CMAKE_SYSTEM_ARCH})
 message(STATUS "*******************************************************")