ion: ioctl compatibility with userland using old api

As far as I can tell, flags passed by userland are now used to determine
buffer caching.

Note in ION_IOC_ALLOC_COMPAT we are currently forcing uncached buffer
allocations (needed to make a choice here).  This
may need to change.
add vfe iommu domains back
fixing unknown iocttl

Signed-off-by: Bryan Smith <zarboz@gmail.com>
fixing unknown iocttl