Support RTOS-less secure image build with Cortex-M23/M33

[ccli8]

Description

By following the instructions of Reducing memory usage by tuning RTOS configuration, I build RTOS-less secure image for on-going, Cortex-M23 based target NUMAKER_PFM_M2351, and meet compile error with mbed-os/rtos/TARGET_CORTEX/mbed_rtx_conf.h unavailable in RTOS-less build. My .mbedignore has the following content:

mbed-os/rtos/*
mbed-os/features/cellular/
mbed-os/features/FEATURE_CLIENT/*
mbed-os/features/FEATURE_COMMON_PAL/*
mbed-os/features/FEATURE_UVISOR/*
mbed-os/features/frameworks/*
mbed-os/features/net/*
mbed-os/features/netsocket/*
mbed-os/features/nvstore/*
mbed-os/features/storage/*
mbed-os/events/*
mbed-os/features/lorawan/*

This PR tries to fix the error. The support for RTOS-less secure image build would be helpful to reduce memory footprint.

Pull request type

[X] Fix
[ ] Refactor
[ ] New target
[ ] Feature
[ ] Breaking change

@deepikabhavnani

[deepikabhavnani]

@ccli8 - We try to minimize changes in CMSIS files. It would be good to move defines into "cmsis/RTE_Components.h" (as that is Mbed OS specific) from mbed_rtx_conf.h.

CC @bulislaw

[ccli8]

@deepikabhavnani Please check the commit
02730f0 for the modification.

[0xc0170]

/morph build

[mbed-ci]

Build : SUCCESS

Build number : 1858
Build artifacts/logs : http://mbed-os.s3-website-eu-west-1.amazonaws.com/?prefix=builds/6747/

Triggering tests

/morph test
/morph uvisor-test
/morph export-build
/morph mbed2-build

[mbed-ci]

Test : SUCCESS

Build number : 1667
Test logs :http://mbed-os-logs.s3-website-us-west-1.amazonaws.com/?prefix=logs/6747/1667

[mbed-ci]

Exporter Build : SUCCESS

Build number : 1505
Build artifacts/logs : http://mbed-os.s3-website-eu-west-1.amazonaws.com/?prefix=builds/exporter/6747/

[0xc0170]

@deepikabhavnani Can you review the update if now the location for those definitions is good?

[deepikabhavnani]

👍