defconfig: msm8226: Enable the memory accelerator regulator driver

The driver configures the power-mode of the memory accelerator
based on the APC (application processor) corner. The ACC setting
improve the stability and performance of cache accesses.

Change-Id: Ie2ff5a9fd93441c4a4e3e0e52fc4bdac93fa31c7
Signed-off-by: Anirudh Ghayal <aghayal@codeaurora.org>