ARM: dts: msm: Add dtsi node for MSM8940

Add dtsi node for WAN Rx size and LAN Rx size.

Assign a value 192 to wan-rx-size and lan-rx-size
nodes to avoid huge memory usage in MSM8940.

Change-Id: I5821abc2421cf55905566e7ca9df50a1cb2a6b32
Acked-by: Mohammed Javid <mjavid@qualcomm.com>
Signed-off-by: Utkarsh Saxena <usaxena@codeaurora.org>