disp: msm: remove use of DMA attributes LLC_NWA and Upstream Hint

Remove DMA_ATTR_IOMMU_USE_LLC_NWA and DMA_ATTR_IOMMU_USE_UPSTREAM_HINT
attributes as they are no longer needed since io-coherency is enabled.
Passing this attribute is a no op since buffer is io-coherent and will
be mapped with a write allocate policy contradicting intention
of that attribute.

Change-Id: I882f148d770c795eb005c5391171a6280c083d37
Signed-off-by: Samantha Tran <samtran@codeaurora.org>

msm/msm_gem_prime.c

@@ -172,8 +172,6 @@ struct drm_gem_object *msm_gem_prime_import(struct drm_device *dev,
 		return ERR_CAST(attach);
 	}
 
-	attach->dma_map_attrs |= DMA_ATTR_IOMMU_USE_LLC_NWA;
-
 	/*
 	 * For cached buffers where CPU access is required, dma_map_attachment
 	 * must be called now to allow user-space to perform cpu sync begin/end