usb: typec: ucsi: drop an unused Kconfig symbol

usb: typec: ucsi: drop an unused Kconfig symbol

EXTCON_TCSS_CROS_EC isn't used anywhere else in the kernel tree,
so drop it from this Kconfig file.

(unless it should be EXTCON_USBC_CROS_EC ?)

Fixes: f1a2241778d9 ("usb: typec: ucsi: Implement ChromeOS UCSI driver")
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Reviewed-by: Abhishek Pandit-Subedi <abhishekpandit@chromium.org>
Reviewed-by: Benson Leung <bleung@chromium.org>
Link: https://patch.msgid.link/20251228190604.2484082-1-rdunlap@infradead.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>