tpm: Update KConfig text to include TPM2.0 FIFO chips

I got a lot of requests lately about whether the new TPM2.0 support
includes the FIFO interface for TPM2.0 as well.
The FIFO interface is handled by tpm_tis since FIFO=TIS (more or less).
-> Update the helptext and headline

Signed-off-by: Peter Huewe <peterhuewe@gmx.de>