defconfig: msm8916: Disable KSM and ZRAM for 1GB

ZRAM and KSM are useful for low memory targets
with 512MB or less memory. So disable them for
1GB target as it would impact power numbers.

Change-Id: Ife730c24da13c592119cd7a294e2d3dd3a498de7
Signed-off-by: Susheel Khiani <skhiani@codeaurora.org>