AMD hudson yangtze: Drop MAX_PHYSICAL_CPUS in comments

Change-Id: I81de291da7b3db8d04a127d5a304b558f1c75b34
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/5535
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>