drivers: ram: rockchip: Fix dram channels calculation for rk3399

Only add the dram channel when we finally setup it successfully at the
last step.

Signed-off-by: Han Pengfei <pengphei@foxmail.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/drivers/ram/rockchip/sdram_rk3399.c b/drivers/ram/rockchip/sdram_rk3399.c
index c0a06dc..8b4d525 100644
--- a/drivers/ram/rockchip/sdram_rk3399.c
+++ b/drivers/ram/rockchip/sdram_rk3399.c
@@ -2964,8 +2964,6 @@
 		if (cap_info->rank == 0) {
 			clear_channel_params(params, 1);
 			continue;
-		} else {
-			params->base.num_channels++;
 		}
 
 		if (IS_ENABLED(CONFIG_RAM_ROCKCHIP_DEBUG)) {
@@ -2991,6 +2989,8 @@
 			printf("no ddrconfig find, Cap not support!\n");
 			continue;
 		}
+
+		params->base.num_channels++;
 		set_ddrconfig(chan, params, channel, cap_info->ddrconfig);
 		set_cap_relate_config(chan, params, channel);
 	}