tegra: nyan: Enable TPM command and driver

The TPM is listed in the device tree. Enable the driver and 'tpm' command
so that it can be used.

Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Christophe Ricard <christophe-h.ricard@st.com>
Reviewed-by: Heiko Schocher <hs@denx.de>