soc/amd/stoneyridge: clean up OSCOUT1_ClkOutputEnb

Change OSCOUT1_ClkOutputEnb programming to use registers from iomap.h
and southbridge.h

BUG=b:69220826
BRANCH=master
TEST=abuild, build Gardenia, build and boot Grunt

Change-Id: Ib138dae6057394740c415e882e4dbd925882c2de
Signed-off-by: Garrett Kirkendall <garrett.kirkendall@amd.corp-partner.google.com>
Reviewed-on: https://review.coreboot.org/25009
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin Roth <martinroth@google.com>
Reviewed-by: Richard Spiegel <richard.spiegel@silverbackltd.com>
2 files changed