tpm, tpm_tis: fix: compare to TPM_STS3_TPM2_FAM

From Stephan Bergers reply:

"""
And use the mask here.

((sts3 & XYZ_MASK) == TPM_STS3_TPM2_FAM)
    chip->flags = TPM_CHIP_FLAG_TPM2;

    Since the bits 00 indicate TPM 1.2, 01 TPM2 and 10 and 11 are
    reserved!

"""

Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>