msm: ais: enable/disable rdi separately

When multiple clients open different rdi paths on the
same DES, if one of them stop camera, it will cause
the other client's camera preview to stop. So open per
RDI path, just enable the individual irq mask.

Change-Id: I4d5d30129a5911a73eb135ef2cc637e8ddd45782
Signed-off-by: YUE CHEN <yueche@codeaurora.org>