ASoC: Fix for incorrect removal detection of headphone

 - Resume of FM playback takes about 5 seconds after end
  of voice call.Since the mic voltage is greater than
  the max headset voltage, a removal interrupt is triggered.
 - Increased the max voltage to fix this issue.

CRs-Fixed: 583301

Change-Id: Ic2381baecf48c9942b6c952bae60dfaa10c03425
Signed-off-by: Shreyas Nagasandra Chandrasekhar <snagas@codeaurora.org>