i2c/pca: Don't use *_interruptible

Unexpected signals can disturb the bus-handling and lock it up. Don't use
interruptible in 'wait_event_*' and 'wake_*' as in commits
dc1972d0 (for cpm),
1ab082d7 (for mpc),
b7af349b

 (for omap).

Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
Signed-off-by: Jean Delvare <khali@linux-fr.org>