cleanup vmap usage in the dma-mapping layer

Hi all, the common DMA remapping code uses the vmalloc/vmap code to create page table entries for DMA mappings. This series lifts the currently arm specific VM_* flag for that into common code, and also exposes it to userspace in procfs to better understand the mappings.

cleanup vmap usage in the dma-mapping layer

Hi all, the common DMA remapping code uses the vmalloc/vmap code to create page table entries for DMA mappings. This series lifts the currently arm specific VM_* flag for that into common code, and also exposes it to userspace in procfs to better understand the mappings, and cleans up a couple