defconfig: kona: Enable LMH DCVSh driver

Enable LMH DCVSh driver, which will be used to vote for the Qref
regulator supply, which is needed by isens controller.

Change-Id: I4307a0e5fa51d458f5ed2a9f8ca015125f8f9d63
Signed-off-by: Ram Chandrasekar <rkumbako@codeaurora.org>