soc: jack: Use power efficient workqueue

Adapted for 3.4 from lsk-v3.10

The accessory detect debounce work is not performance sensitive so let
the scheduler run it wherever is most efficient rather than in a per CPU
workqueue by using the system power efficient workqueue.

Change-Id: I0fdf395d2c15b0f4a6e05b80fb36af99198d48c1