refactor(tc): use internal trusted storage

Trusted Services had removed secure storage and added two new
trusted services - Protected Storage and Internal Trusted Storage.
Hence we are removing secure storage and adding support for the
internal trusted storage.

And enable external SP images in BL2 config for TC, so that
we do not have to modify this file whenever the list of SPs
changes. It is already implemented for fvp in the below commit.

commit 33993a3737737a03ee5a9d386d0a027bdc947c9c
Author: Balint Dobszay <balint.dobszay@arm.com>
Date:   Fri Mar 26 15:19:11 2021 +0100

    feat(fvp): enable external SP images in BL2 config

Change-Id: I3e0a0973df3644413ca5c3a32f36d44c8efd49c7
Signed-off-by: Davidson K <davidson.kumaresan@arm.com>
3 files changed