Enable TPM TIS SPI support for TPM1.2 and TPM2.0 chips

This patch enables the support for SPI TPMs which follow the TCG TIS
FIFO/PTP specification like the SLB9670.
In order to decrease ram usage the weak dependency on CONFIG_SECURITFS
is explictly set to 'n'.

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