switch: arizona: Enable mic det along with hp det

The headphone detect may fail to run if the microphone detect did not
exit cleanly. Work around this by always running a microphone detection
along side a headphone detection.

Change-Id: I930c6e8bd357337acf08f3ca3de62e02781ebe4a
Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>