payloads: Move secondary payloads inside of a submenu

To keep the list of 'secondary' payloads from cluttering the payloads
menu, move them into their own menu under the payloads menu.  Then they
don't need any dependencies other than the architecture.

Change-Id: I95119750c6ef627ef0de9b5f5cbad085a51ac2bb
Signed-off-by: Martin Roth <martinroth@google.com>
Reviewed-on: https://review.coreboot.org/13941
Tested-by: build bot (Jenkins)
Reviewed-by: Ben Gardner <gardner.ben@gmail.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
1 file changed