tpm: tpm_tis_i2c: Merge struct tpm into tpm_chip

tpm: tpm_tis_i2c: Merge struct tpm into tpm_chip

There are too many structures storing the same sort of information. Move the
fields from struct tpm into struct tpm_chip and remove the former struct.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Heiko Schocher <hs@denx.de>