mainboard/intel/galileo: Add GPIO initialization

Add Kconfig to configure coreboot for a specific Galileo board.
Configure the GPIOs for the specific Galileo board.

TEST=Build and run on Galileo Gen2

Change-Id: I992460d506b5543915c27f6a531da4b1a53d6505
Signed-off-by: Lee Leahy <leroy.p.leahy@intel.com>
Reviewed-on: https://review.coreboot.org/14826
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>
5 files changed