staging: ti dspbridge: use stream id instead of kernel address

Send stream ids to the user instead of handles, then when
the id is coming from user dspbridge can retrive the handle
using id and avoid using invalid handles.

Signed-off-by: Ernesto Ramos <ernesto@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>