iommu/ipmmu-vmsa: Use the ARM LPAE page table allocator

Replace the custom page table allocation implementation with the
standard allocator.

The driver loses the ability to map 64kB chunkgs using the PTE
contiguous hint, hence the removal of the SZ_64K page size from the
IOMMU page sizes bitmap.
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>

drivers/iommu/Kconfig

@@ -313,6 +313,7 @@ config IPMMU_VMSA
 	depends on ARM_LPAE
 	depends on ARCH_SHMOBILE || COMPILE_TEST
 	select IOMMU_API
+	select IOMMU_IO_PGTABLE_LPAE
 	select ARM_DMA_USE_IOMMU
 	help
 	  Support for the Renesas VMSA-compatible IPMMU Renesas found in the