build: Update TF-RMM release version to v0.6.0

Bump up the TF-RMM version to 0.6.0. This has been tested with
TF-A v2.12 release.


Change-Id: Ic666ae7fde959df421833acd9db4b9e9a457d986
Signed-off-by: Soby Mathew <soby.mathew@arm.com>
1 file changed