drm/msm/adreno: Check for recognized GPU before bind

If we have a newer dtb than kernel, we could end up in a situation where
the GPU device is present in the dtb, but not in the drivers device
table.  We don't want this to prevent the display from probing.  So
check that we recognize the GPU before adding the GPU component.

v2: use %pOF

Signed-off-by: Rob Clark <robin.clark@oss.qualcomm.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Patchwork: https://patchwork.freedesktop.org/patch/657701/