usb: typec: Remove unused ucsi_cci_str

ucsi_cci_str() last use was removed in 2019 by
commit 2ede5546 ("usb: typec: ucsi: Remove the old API")

Remove it.

Signed-off-by: "Dr. David Alan Gilbert" <linux@treblig.org>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Link: https://lore.kernel.org/r/20250609004319.209143-1-linux@treblig.org


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