Use vm_iomap_memory() instead of [io_]remap_pfn_range().
vm_iomap_memory() gives us much simpler API to map memory to userspace,
and reduces possibilities for bugs.
Signed-off-by: NTomi Valkeinen <tomi.valkeinen@ti.com>
Acked-by: NRussell King <rmk+kernel@arm.linux.org.uk>