ASoC: wcd-mbhc: Fix unbalanced irq enable/disable

Fix unbalanced mbhc electrial irq enable/disable to
avoid detection failures when headset or headphone
is inserted into an extension cable at the other
end.

Change-Id: I2eb9096f1cb45957a3d511af86cb630348581e0b
Signed-off-by: Phani Kumar Uppalapati <phaniu@codeaurora.org>