defconfig: msm: Enable ZRAM support for msm8916 64 bit

ZRAM can help system serve better under memory
high pressure by creating compressed block device
in RAM which acts as swap space.

Change-Id: I6eb0587c0b4e16d228566f32f956a99e4b867e71
Signed-off-by: Susheel Khiani <skhiani@codeaurora.org>