rockchip: dmc: rk3368: update rank number for evb-px5

evb-px5 has only 1 CS, update for it.

Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
Tested-by: Andy Yan <andy.yan@rock-chips.com>
diff --git a/drivers/ram/rockchip/dmc-rk3368.c b/drivers/ram/rockchip/dmc-rk3368.c
index 92f584f..e52fc3b 100644
--- a/drivers/ram/rockchip/dmc-rk3368.c
+++ b/drivers/ram/rockchip/dmc-rk3368.c
@@ -842,7 +842,11 @@
 	move_to_access_state(pctl);
 
 	/* TODO(prt): could detect rank in training... */
+#ifdef CONFIG_TARGET_EVB_PX5
+	params->chan.rank = 1;
+#else
 	params->chan.rank = 2;
+#endif
 	/* TODO(prt): bus width is not auto-detected (yet)... */
 	params->chan.bw = 2;  /* 32bit wide bus */
 	params->chan.dbw = params->chan.dbw;  /* 32bit wide bus */