Change in coreboot[master]: mainboard/google/poppy: Add support for cr50 I2C TPM

[Furquan Shaikh (Code Review)]

Hello build bot (Jenkins),

I'd like you to reexamine a change.  Please visit

https://review.coreboot.org/19518

to look at the new patch set (#2).

Change subject: mainboard/google/poppy: Add support for cr50 I2C TPM
......................................................................

mainboard/google/poppy: Add support for cr50 I2C TPM

1. Add support for using cr50 I2C TPM on poppy. This will not be
enabled until the next build.
2. Also, configure GPIOs for SPI and I2C TPM only if the corresponding
Kconfig options are set.

BUG=b:36265511
TEST=Verified on a reworked board that I2C TPM communication works
fine.

Change-Id: I3b293b8d410a6973a6dfea393c17d0be425b6a28
Signed-off-by: Furquan Shaikh 
---
M src/mainboard/google/poppy/Kconfig
M src/mainboard/google/poppy/variants/baseboard/devicetree.cb
M src/mainboard/google/poppy/variants/baseboard/gpio.c
3 files changed, 50 insertions(+), 8 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/18/19518/2