google/fizz: Enable onboard lan

Enable RT8168_GET_MAC_FROM_VPD in fizz Kconfig.

BUG=b:62090148, b:35775024
BRANCH=None
TEST=Boot to kernel.  Insert mac address into VPD
     vpd -s ethernet_mac=<address>
     reboot the system.
     Ensure we have ip address and corresponding mac
     address with ifconfig.
     Ensure ethernet controller shows up with lspci.

Change-Id: I00f63dcb56a2c9a4600c8461bc94e06ec5ab2d81
Signed-off-by: Shelley Chen <shchen@chromium.org>
Reviewed-on: https://review.coreboot.org/20232
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>

src/mainboard/google/fizz/Kconfig

@@ -16,6 +16,7 @@ config BOARD_SPECIFIC_OPTIONS
 	select SOC_INTEL_KABYLAKE
 	select FIZZ_USE_I2C_TPM
 	select GENERIC_SPD_BIN
+	select RT8168_GET_MAC_FROM_VPD
 
 config VBOOT
 	select EC_GOOGLE_CHROMEEC_SWITCHES