msm7x30: Add flag for new adreno blobs

Change-Id: I455a2a4b5ee533effe6ae7b894d387eb1caaed32
msm7x30: Update gralloc_priv.h header

* Add support for new gralloc

Change-Id: Ifb1dd85eeca9e5798e685a46e3488254b3b9bc4e
msm7x30: Enable MDP composition

Change-Id: I6ff5ba6ae07b682d4cd463841678b7aae18a1a31
msm7x30: Fix default USB mode

* Default USB mode is part of default.prop and not build.prop
* Override the property correctly

Change-Id: Ic4c265721b7b859713e6639971443967973f254b