Remove old AMD fam10 fixme comment

Remove old AMD fam10 fixme comment

The family10 code had a very slow decompress before the cache settings were
fixed. This has been fixed for some time. Remove all the old messages from the
serial stream.

Change-Id: I476efe1a430f702af394734f354ff69bd053f1d2
Signed-off-by: Marc Jones <marc.jones@se-eng.com>
Reviewed-on: http://review.coreboot.org/672
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>