[TF-M] TF-M git repo normalization

Hi all,

Following the git normalization topic of the tech forum yesterday, I checked TF-M. It has not been enabled the git normalization feature. I've made a patchhttps://review.trustedfirmware.org/c/TF-M/trusted-firmware-m/+/8283 to make this happen.

Please check out or rebase your work upon this patch to see any issues. Your existing working tree should not be affected regarding the line-endings.

What is the normalization? To be simple, different developers on different Host OS can have different line-endings in their local working tree and do not need to worry about interference with each other.

Reference: https://git-scm.com/docs/gitattributes

Best Regards, Kevin