msm: cpr: Avoid adding a step up to voltage set during config

The calibrated voltage could be at times set at the Vmax.
Avoid adding an extra step to this voltage to always
stay within permissible range of PMIC.

Change-Id: Ie7049b94c0344d2baa413422fb9ff77bb64c1a37
Signed-off-by: Kaushal Kumar <kaushalk@codeaurora.org>