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/scripts/cmake/cmsis-dsp.cmake b/scripts/cmake/cmsis-dsp.cmake
index 73f6100..f22d5ef 100644
--- a/scripts/cmake/cmsis-dsp.cmake
+++ b/scripts/cmake/cmsis-dsp.cmake
@@ -68,16 +68,8 @@
     endif()
 endif ()
 
-# 5. Add any custom/conditional flags for compilation or linkage
-if ("${CMAKE_SYSTEM_PROCESSOR}" STREQUAL "cortex-m55" OR "${CMAKE_SYSTEM_ARCH}" STREQUAL "armv8.1-m.main")
-    target_compile_definitions(${CMSIS_DSP_TARGET} PUBLIC
-        ARM_MATH_MVEI
-        ARM_MATH_DSP
-        ARM_MATH_LOOPUNROLL)
-elseif(${CMAKE_SYSTEM_PROCESSOR} STREQUAL cortex-m33)
-    # Placeholder, if building with Cortex-M33
-endif()
-
+# 5. General compile definitions
+target_compile_definitions(${CMSIS_DSP_TARGET} PUBLIC ARM_MATH_LOOPUNROLL)
 
 # 6. Provide the library path for the top level CMake to use:
 set(CMSIS_DSP_LIB   "${CMAKE_LIBRARY_OUTPUT_DIRECTORY}/lib${CMSIS_DSP_TARGET}.a")