usb: typec: ucsi: ccg: add get_fw_info function

Function is to get the details of ccg firmware and device version.
It will be useful in debugging and also during firmware update.

Signed-off-by: Ajay Gupta <ajayg@nvidia.com>
Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>