Add support for 100MHz reference clock on ivybridge.
Allows to use more frequencies than sandybridge.
Tested on Lenovo T430 (Intel IvyBridge) on DDR3-1800.
Change-Id: I780d34ded2c1e3737ae1af685c8c2da832842e7c
Signed-off-by: Patrick Rudolph <siro@das-labor.org>
Reviewed-on: https://review.coreboot.org/17607
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>
cab4d3df39