arm: dts: qcom: apq8064: Add dsi, gpu and iommu nodes

Adds the core gpu, and dsi nodes for the apq8064 needed
to get graphics working on the nexus7 and other devices.

These apply on top of Archit's patch set that enables HDMI for IFC6410

Feedback would be greatly appreciated!

Cc: Archit Taneja <architt@codeaurora.org>
Cc: vinay simha <vinaysimha@inforcecomputing.com>
Cc: andy.gross@linaro.org
Cc: robdclark@gmail.com
Cc: linux-arm-msm@vger.kernel.org
Cc: dri-devel@lists.freedesktop.org
Signed-off-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Andy Gross <andy.gross@linaro.org>