staging: android: ion: Drop ion_phys interface

ion_phys was an interface used for older legacy behavior. sg_tables
are the standard now. Get rid of it.

Signed-off-by: Laura Abbott <labbott@redhat.com>
Reviewed-by: Benjamin Gaignard <benjamin.gaignard@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>