[PORT FROM R2] atomisp: do not restart ISP from ISR when next stage is accel fw

[PORT FROM R2] atomisp: do not restart ISP from ISR when next stage is accel fw

BZ: 20531

Accel fw always do memory (de)allocation when starting. For such reason,
accel stages cannot be started from atomic context.

Change-Id: Ifefb7fe6a076bb9f62430a50f8bbd80dadf2f308
Orig-Change-Id: Ibd982ea9e90363f0f9b816c57157d9b5e1ec525a
Signed-off-by: David Cohen <david.a.cohen@intel.com>
Reviewed-on: http://android.intel.com:8080/30237
Reviewed-by: Wang, Wen W <wen.w.wang@intel.com>
Reviewed-by: Koski, Anttu <anttu.koski@intel.com>
Reviewed-by: Von Oerthel, Jurgen <jurgen.von.oerthel@intel.com>
Tested-by: Koski, Anttu <anttu.koski@intel.com>
Reviewed-by: buildbot <buildbot@intel.com>
Tested-by: buildbot <buildbot@intel.com>
Reviewed-on: http://android.intel.com:8080/32443
Reviewed-by: Lampila, KalleX <kallex.lampila@intel.com>
Tested-by: Lampila, KalleX <kallex.lampila@intel.com>