feat(libtl): integrate Transfer List Library as submodule

Replaces in-tree transfer_list implementation with LibTL submodule.
Removes legacy source and headers, updates includes and makefiles
to use the standalone library. Adds architecture-specific inttypes
headers for compatibility.

Change-Id: Iff8272a6417983b9fb8e7f6bde6db44c2a6020f5
Signed-off-by: Harrison Mutai <harrison.mutai@arm.com>
13 files changed