defconfig: Enable subsystem sleep stats driver for holi

This enables subsystem sleep stats driver. This driver provides
a way to read statistical information of different subsystem
from SMEM.

Change-Id: I4effedf3112d8fdb01a67e7d42f9729ebab3513e
Signed-off-by: Tushar Nimkar <tnimkar@codeaurora.org>