defconfig: msm: Enable Cx ipeak driver for Bengal

Enable common Cx ipeak driver for various multimedia
clients like GPU, MDP, Venus and Camera modules.
This is needed to handle Cx ipeak limit on Bengal.

Change-Id: Ifa6d483cdc61663f1e77e5420ff1e4400901d63f
Signed-off-by: Deepak Kumar <dkumar@codeaurora.org>