defconfig: 8994: Enable CPU boost driver

This driver does sync of CPU frequencies on migration of an important
thread from a fast CPU to a slow CPU.
It also boosts CPU scaling_min to a userspace specified value on
touch events

Change-Id: I82a6774f2167104d4dd6af97ef0fa13a0cc66806
Signed-off-by: Rohit Gupta <rohgup@codeaurora.org>