drm/msm: Call msm_init_vram before binding the gpu

vram.size is needed when binding a gpu without an iommu and is defined
in msm_init_vram(), so run that before binding it.

Signed-off-by: Craig Tatlor <ctatlor97@gmail.com>
Reviewed-by: Brian Masney <masneyb@onstation.org>
Tested-by: Alexey Minnekhanov <alexeymin@postmarketos.org>
Signed-off-by: Rob Clark <robdclark@chromium.org>