Change in coreboot[master]: tpm: Refactor TPM Kconfig dimensions

[Michael Niewöhner (Code Review)]

Attention is currently required from: Stefan Ott, Felix Singer, Patrick Rudolph, Jonathan Zhang, Nick Vaccaro, Arthur Heymans, Andrey Petrov, Piotr Król, Jes Klinke, Nico Huber, Sean Rhodes, Michał Żygowski, Johnny Lin, Christian Walter, Werner Zeh, Alexander Couzens, Yu-Ping Wu, Tim Chu, Frans Hendriks, Tristan Corrick, Jeremy Soller, Angel Pons, Julius Werner, Tim Crawford, Maxim Polyakov, Tim Wawrzynczak.
Michael Niewöhner has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/63424 )

Change subject: tpm: Refactor TPM Kconfig dimensions
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Patch Set 5:

(2 comments)

Commit Message:

https://review.coreboot.org/c/coreboot/+/63424/comment/96b9e035_093a2755 
PS3, Line 22: LPC_TPM
> I have no familiarity with LPC at all. […]

The driver `src/drivers/pc80/tpm` is based on the TPM TIS 
specification, which describes this memory mapping for LPC/SPI TPM. However, only SPI TPMs connected via that specific SPI interface with CS#2 works. Any other (generic) SPI connection must use a real SPI driver.

`MEMORY_MAPPED_TPM` sounds good, I guess. MM is too unclear. `MEMMAPPED_TPM` could be an option if we wanted to keep it shorter

https://review.coreboot.org/c/coreboot/+/63424/comment/5e65e9cc_faa314db 
PS3, Line 18: // How the TPM chip is connected on the mainboard.
            : config CRB_TPM
            : config I2C_TPM
            : config SPI_TPM
            : config LPC_TPM (new)
            :
> Julius suggested in https://review.coreboot.org/c/coreboot/+/63285 that MAINBOARD_HAS_XXX vs. […]

I see, thanks