mb/google/fizz: Enable NIC leds

This patch enables customized NIC leds as follows:

	Green	Orange (Amber)
100M	off	blinking
1000M	on	blinking

BUG=b:65437780, b:68284778
TEST=Make sure the registers are programmed as expected and observe the
     LEDs are behaving as expected. Perform suspend/resume test and the
     LEDs are still working as expected.

Change-Id: I9bb1367a4c742c2755d620e14ee6dfe70ee7f34b
Signed-off-by: Gaggery Tsai <gaggery.tsai@intel.com>
Reviewed-on: https://review.coreboot.org/22293
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Furquan Shaikh <furquan@google.com>
2 files changed