Scarlet and Bob use the Google-developed cr50 chip to do things
like TPM and closed-case-debugging.

Add the nodes describing the cr50 and its spi-connection.
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Link: https://lore.kernel.org/r/20180822120925.12388-1-heiko@sntech.de