fix a bug constraint scale and bandwidth (IVA)

This issue reproduced on next steps:
1. Start AV playback
2. Perform Suspend/Resume

Actual Result:
"error setting constraint scale" and "error bandwidth constraint" errors occur (logs are attached).

This issue to arises in next situation:
1. vidio is playing.
2. call function early_suspend (push suspend button)
handler function for abe_early_suspend entered in the dpll_cascading,
all condition are met for entrance to dpll_cascading is:
 system is in early suspend (screen is off)
 single stream is active and is LP (ping-pong)
 OPP is 50 or less (DL1 path only)
3. vidio stops (do not exit from the dpll_cascading )
4. invokes function rpres_set_constraints:
 call omap_device_scale which returns EBUSY, if dpll_cascading has status enabled.
5. print errors

 drivers/remoteproc/rpres.c |    4 ++++
 1 file changed, 4 insertions(+)

Change-Id: I9c3afbde8d4ed0ac6fe77d04d1eee6f1ca44da4a
Signed-off-by: Artur Polivenko <x0199365@ti.com>