usb: typec: ucsi: Fix the return value of ucsi_run_command()

usb: typec: ucsi: Fix the return value of ucsi_run_command()

The command execution routines need to return the amount of
data that was transferred when succesful.

This fixes an issue where the alternate modes and the power
delivery capabilities are not getting registered.

Fixes: 5e9c1662a89b ("usb: typec: ucsi: rework command execution functions")
Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Link: https://lore.kernel.org/r/20240809150343.286942-1-heikki.krogerus@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>