ARM: dts: msm: Add GPU mempool configuration for Bengal 32bit

Add GPU mempool configuration for 32bit Bengal. This configuration
doesn't reserve any memory upfront and adds a limit on higher order
pages that can be pooled. This is needed to optimize memory footprint
for 32bit devices.

Change-Id: I8f15251433d564dc7bea63cf344d7b3e81139cbe