Revert "power: pm8921-charger: add boundary check for out of bounds issues"

This reverts commit 13c972d87f309a326449b42b50b1b923ef3e168f,
which is a duplicate cherry-pick already done by a mega cherry-pick patch
from msm-3.4 branch.

Change-Id: I8a394645d4a80f236cec63fb0ea7a09ff896319a
Signed-off-by: Willie Ruan <wruan@codeaurora.org>
Merge "Revert "power: pm8921-charger: add boundary check for out of bounds issues""