drivers/i2c: Add i2c TPM support for different stages

Change-Id: Ib0839933f8b59f0c87cdda4e5374828bd6f1099f
Signed-off-by: Philipp Deppenwiese <zaolin@das-labor.org>
Reviewed-on: https://review.coreboot.org/23759
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: David Hendricks <david.hendricks@gmail.com>

src/soc/intel/apollolake/Makefile.inc

@@ -71,6 +71,7 @@ ramstage-y += sd.c
 postcar-y += memmap.c
 postcar-y += mmap_boot.c
 postcar-y += spi.c
+postcar-y += i2c.c
 postcar-$(CONFIG_SOC_UART_DEBUG) += uart.c
 
 postcar-$(CONFIG_FSP_CAR) += exit_car_fsp.S