Set a temporary I2C base address during romstage. TEST=Build and run on Galileo Gen2 Change-Id: I4b427c66a4e7e6d30cc611d4d3c40bb0ea36066d Signed-off-by: Lee Leahy <leroy.p.leahy@intel.com> Reviewed-on: https://review.coreboot.org/15006 Tested-by: build bot (Jenkins) Reviewed-by: Martin Roth <martinroth@google.com>