CONFIGS: Adds in a group containing all platforms

A new group which will be used in the nightly with tf-m-extra-build to sanity
check that all platforms are building.

Change-Id: I5693a4441b6640332b502dfebefb0890ec6c440d
Signed-off-by: Matthew Dalzell <matthew.dalzell@arm.com>
1 file changed