video: driver: utilize mod_delayed_work functionality

mod_delayed_work() is a replacement for cancel_delayed_work()
+ queue_delayed_work(). It will update only timer value,
instead of completely cancelling and queueing a new delayed
work.

Change-Id: Id07d54e025c5a2e82f29160ae6d249d44f00bb15
Signed-off-by: Govindaraj Rajagopal <grajagop@codeaurora.org>

driver/vidc/src/msm_vdec.c

@@ -1437,8 +1437,7 @@ static int schedule_batch_work(struct msm_vidc_inst *inst)
 		return -EINVAL;
 	}
 	core = inst->core;
-	cancel_delayed_work(&inst->decode_batch.work);
-	queue_delayed_work(core->batch_workq, &inst->decode_batch.work,
+	mod_delayed_work(core->batch_workq, &inst->decode_batch.work,
 		msecs_to_jiffies(core->capabilities[DECODE_BATCH_TIMEOUT].value));
 
 	return 0;

driver/vidc/src/venus_hfi.c

@@ -346,10 +346,8 @@ static void __schedule_power_collapse_work(struct msm_vidc_core *core)
 		return;
 	}
 
-	cancel_delayed_work(&core->pm_work);
-	if (!queue_delayed_work(core->pm_workq,
-			&core->pm_work, msecs_to_jiffies(
-			core->capabilities[SW_PC_DELAY].value))) {
+	if (!mod_delayed_work(core->pm_workq, &core->pm_work,
+			msecs_to_jiffies(core->capabilities[SW_PC_DELAY].value))) {
 		d_vpr_e("power collapse already scheduled\n");
 	} else {
 		d_vpr_l("power collapse scheduled for %d ms\n",