usb: typec: ucsi: extract common code for command handling

Extract common functions to handle command sending and to handle events
from UCSI. This ensures that all UCSI glue drivers handle the ACKs in
the same way.

The CCG driver used DEV_CMD_PENDING both for internal
firmware-related commands and for UCSI control handling. Leave the
former use case intact.

Tested-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://lore.kernel.org/r/20240627-ucsi-rework-interface-v4-6-289ddc6874c7@linaro.org


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>