usb: typec: tcpci_maxim: Chip level TCPC driver

Chip level TCPC driver for Maxim's TCPCI implementation.
This TCPC implementation does not support the following
commands: COMMAND.SinkVbus, COMMAND.SourceVbusDefaultVoltage,
COMMAND.SourceVbusHighVoltage. Instead the sinking and sourcing
from vbus is supported by writes to custom registers.

Signed-off-by: Badhri Jagan Sridharan <badhri@google.com>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Link: https://lore.kernel.org/r/20201008061556.1402293-5-badhri@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>