xen/arm: smmuv3: Remove Linux specific code that is not usable in XEN

xen/arm: smmuv3: Remove Linux specific code that is not usable in XEN

Remove code that is related to below functionality :
 1. struct io_pgtable_ops
 2. struct io_pgtable_cfg
 3. struct iommu_flush_ops,
 4. struct iommu_ops
 5. module_param_named, MODULE_PARM_DESC, module_platform_driver,
    MODULE_*
 6. IOMMU domain-types
 7. arm_smmu_set_bus_ops
 8. iommu_device_sysfs_add, iommu_device_register,
    iommu_device_set_fwnode

Signed-off-by: Rahul Singh <rahul.singh@arm.com>
Reviewed-by: Bertrand Marquis <bertrand.marquis@arm.com>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>