drm/msm: don't crash if no msm.vram param
If VRAM carveout is used, due to no IOMMU, we should have a default value for msm.vram so that we don't simply crash. Reported-by: NSrinivas Kandagatla <srinivas.kandagatla@linaro.org> Signed-off-by: NRob Clark <robdclark@gmail.com>
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