disp: msm: use FB_NON_SEC_DIR_TRANS plane hint for TUI VM buffers

Add plane buffer flag to get the correct aspace during
TUI VM usecase. FB_NON_SEC_DIR_TRANS plane flag is set
by user-mode to indicate S2-only non-secure buffer in
TUI VM. Return the default drm device when SMMU is not
available during get_aspace_device to make the working
seamless with/without SMMU.

Change-Id: I158dc17ba51ff4b2f302d3e7017db8ab3cfe2b84
Signed-off-by: Veera Sundaram Sankaran <veeras@codeaurora.org>

msm/msm_gem.c

@@ -1259,12 +1259,6 @@ struct drm_gem_object *msm_gem_import(struct drm_device *dev,
 	int ret;
 	unsigned long flags = 0;
 
-	/* if we don't have IOMMU, don't bother pretending we can import: */
-	if (!iommu_present(&platform_bus_type)) {
-		dev_err(dev->dev, "cannot import without IOMMU\n");
-		return ERR_PTR(-EINVAL);
-	}
-
 	size = PAGE_ALIGN(dmabuf->size);
 
 	ret = msm_gem_new_impl(dev, size, MSM_BO_WC, dmabuf->resv, &obj,