Some chips do not require enter/exit sequences. This causes them to be

Some chips do not require enter/exit sequences. This causes them to be
detected and printed multiple times in probe_idregs_* functions where a
simple series of enter --> probe/print --> exit calls are made.

This patch adds a simple check after each set of those calls to make the
functions quit after a chip is found.

Signed-off-by: David Hendricks <dhendrix@google.com>
Acked-by: Uwe Hermann <uwe@hermann-uwe.de>
git-svn-id: svn://svn.coreboot.org/coreboot/trunk@5689 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1