embedded-a/corstone1000: Fix clean secure flash compatibility with TF-M v2.1.1 inc
requested to merge iot/open-iot-sdk/examples/systemready-patch:dev/hugkam01/update_for_tfm_2.1.1 into master
Remove snippet in Corstone-1000 Clean Secure Flash patch to allow it to be applied regardless of what is the first patch in the file to be modified.