power: pm8xxx-ccadc: Cancel/schedule the calibration work in suspend/resume

Cancel the ccadc calibration work in suspend as there is
a possibility that the device can suspend while executing
the calib work. This may lead to an incomplete hardware
configuration.

CRs-Fixed: 487268
Change-Id: I86dfffeaa7a60784d16243ffd7273c3dc8571bda
Signed-off-by: Anirudh Ghayal <aghayal@codeaurora.org>