Boot: Rename NO_SWAP upgrade strategy to DIRECT_XIP

The NO_SWAP upgrade strategy was upstreamed to the mainline
MCUboot repo, but the feature was renamed to DIRECT_XIP.
This change do the same renaming in TF-M to be aligned with
the mainline repo, because the MCUboot fork is going to be
removed from the TF-M repository.

Change-Id: I63201a5319a68394d45d753a700444cdc848b5dc
Signed-off-by: Tamas Ban <tamas.ban@arm.com>
5 files changed