AMD Persimmon: mainboard.c: Make comment generic to reduce difference

Replace »persimmon« by »board« in comment to keep `diff` output
between boards small.

Change-Id: Ieae2a63782c488ae35f22eb30f5b1049200d12c8
Signed-off-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-on: http://review.coreboot.org/2611
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martin.roth@se-eng.com>
1 file changed