ASoC: wcd: acquire lock during cable detection

Currently we are not acquiring lock due to this in
rare conditions system is going to suspend during detection
sequence, which is resulting in skipping an interrupt.
So ensure lock is acquired during headset detection to keep
the system awake.

CRs-Fixed: 715847
Change-Id: If46cfef371effb2ff1b09e6bd9079836ce34e48f
Signed-off-by: Yeleswarapu Nagaradhesh <nagaradh@codeaurora.org>