ARM: dts: msm: Add a DTS file for SMB1360 512MB-DDR 8909 MTP

Add a DTS file to support 512MB-DDR configuration for 8909MTP
with SMB1360 external charger. Add the required DT nodes to
enable SMB1360 and disable the internal charger.

While at it, update the 'model name' for 1GB smb1360 8909 MTP.

Change-Id: I41f0c8fb60a276414c273ccae1dfa4de5bc445f8
Signed-off-by: Anirudh Ghayal <aghayal@codeaurora.org>