tf-m-extra-build: Adds nightly_all_plat to default

Adds the new nightly_all_plat group to the default timer based run of
the job. This is to ensure we are testing the build of each platform
nightly.

Change-Id: Ifeb2eaba540cdad2b899445f8aa8f318c58e1a2e
Signed-off-by: Matthew Dalzell <matthew.dalzell@arm.com>
1 file changed