ARM: dts: msm: Add the DT node for MSMTITANIUM GFX LDO

The GPU core is powered by an LDO/BHS regulator.
Add the device tree properties for this regulator.

Also add the mem-acc regulator node.

Change-Id: I42192943136df9e5f13bc3a1c406a57520a3dc6b
Signed-off-by: Anirudh Ghayal <aghayal@codeaurora.org>