Change in coreboot[master]: tpm: Remove USER_TPMx options, make TPM1/TPM2 menuconfig visible

[Julius Werner (Code Review)]

Attention is currently required from: Philipp Deppenwiese, Michał Żygowski, Paul Menzel, Piotr Król.
Julius Werner has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/54641 )

Change subject: tpm: Remove USER_TPMx options, make TPM1/TPM2 menuconfig visible
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Patch Set 3:

(1 comment)

Commit Message:

https://review.coreboot.org/c/coreboot/+/54641/comment/79fe9bc5_95781069 
PS3, Line 19: Also fix some mainboards that selected TPM2 directly, which they're not
            : supposed to do (that's what MAINBOARD_HAS_TPM2 is for), and add a
            : missing dependency to TPM_CR50 so it is set correctly for a NO_TPM
            : scenario.
> It’d be great if you split this into a separate commit.

Let's please not make things too complicated, I don't want to reshuffle both my and Kyösti's patch just for that.