defconfig: Enable OverlayFS for MSM8953 and MSM8937

OverlayFS is needed to be enabled to align with the latest android
base config. Enable it for MSM8953, SDM450, MSM8917, SDM429 and Pukeena.

Change-Id: Ieb37808ff60758540da207446346020899f1010f
Signed-off-by: Tengfei Fan <tengfeif@codeaurora.org>