Customer is reporting that our documentation is inconsistent across u-boot with respect to the name of the DM-R5 firmware image name

We updated that firmware name in 11.1 to reflect that it is a DM and Edge AI image, rather than an echo-test. Previous SDK's were confusing in this respect – the new name is more precise.

This docs-bug should be resolved in u-boot documentation

• Also noted that the name of the firmware in u-boot may also need update in k3-am62a-sk-binman.dtsi

A secondary bug they noted is inconsistent TF-A git repo URL's
 
e2e: https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1559528/am62a7-sdk-11-1-u-boot-ipc_echo-firmware-missing-from-prebuilts-directory 

Fixed by: https://github.com/TexasInstruments/processor-sdk-doc/pull/456