qcacmn: make qdf_time_t synonymous with system ticks

Currently the use of qdf_time_t vs unsigned long is arbitrary.

Change-Id: I658b1e9169e50389f9054b9fe1d229e51e578461
CRs-Fixed: 1017055
diff --git a/hif/src/ce/ce_main.h b/hif/src/ce/ce_main.h
index 79ed109..7a79968 100644
--- a/hif/src/ce/ce_main.h
+++ b/hif/src/ce/ce_main.h
@@ -126,7 +126,7 @@
 	bool fake_sleep;
 	qdf_timer_t sleep_timer;
 	bool sleep_timer_init;
-	unsigned long sleep_ticks;
+	qdf_time_t sleep_ticks;
 
 	/* Per-pipe state. */
 	struct HIF_CE_pipe_info pipe_info[CE_COUNT_MAX];