usb: typec: tps6598x: mask status update

We don't need the status update unless it's plugged in.

With broken CC lines the cable sometimes shows as plugged in even when it
isn't. Look further into the status register to see if it is connected and
disable the STATUS interrupt to stop the irq storm.
Signed-off-by: Angus Ainslie <angus@akkea.ca>