feat(arm): provide some swd rotpk files

When using the new cca chain of trust, a new root of trust key is needed
to authenticate the images belonging to the secure world. Provide a
development one to deploy this on Arm platforms.

Signed-off-by: Lauren Wehrmeister <lauren.wehrmeister@arm.com>
Change-Id: I9ea7bc1c15c0c94c1021d879a839cef40ba397e3