video: driver: amend stop and last flag processing

- do not ignore last flag buffer in last flag not allowed
  case also
- ignore stop command if input port is not streaming
  instead of returning -EBUSY error.
- defer input port settings change in few states instead of
  ignoring it.

Change-Id: I705f0c8ae2da899a5d262f6246aa65de5591ac26
Signed-off-by: Maheshwar Ajja <majja@codeaurora.org>

driver/vidc/inc/msm_vidc_internal.h

@@ -713,6 +713,13 @@ struct msm_vidc_buffers {
 	bool                   reuse;
 };
 
+enum msm_vidc_allow {
+	MSM_VIDC_DISALLOW = 0,
+	MSM_VIDC_ALLOW,
+	MSM_VIDC_DEFER,
+	MSM_VIDC_IGNORE,
+};
+
 enum response_work_type {
 	RESP_WORK_INPUT_PSC = 1,
 	RESP_WORK_OUTPUT_PSC,