soc/amd/stoneyridge: Add function to enable I2C host controllers

In preparation for moving AGESA calls out of bootblock:
Add function to enable the four stoneyridge I2C engines.

TEST=abuild, build Gardenia, build and boot Grunt (with other changes
to call code not committed at this time)

Change-Id: Icb55c49cf56c65a9c2e1838cff1ed5afc04e1826
Signed-off-by: Garrett Kirkendall <>
Reviewed-by: Aaron Durbin <>
Reviewed-by: Richard Spiegel <>
Tested-by: build bot (Jenkins) <>
2 files changed