msm: board7627a: Disabling ZSL feature on low RAM devices

ZSL feature is enabled only for devices with more than 512MB DDR
or 512MB DDR and CMA enabled.

Change-Id: I2c5f56090d03a09f273903eca7af0d410a0a84c2
Signed-off-by: Sravan Kumar Ambapuram <asravan@codeaurora.org>
Merge "msm: board7627a: Disabling ZSL feature on low RAM devices"