clk: rockchip: rk3308: Make sclk_ddrc critical

Change-Id: I1bf8ae0677c90fa725ecb6f3ab88f12483377fd9
Signed-off-by: Finley Xiao <finley.xiao@rock-chips.com>

Author: finley1226

drivers/clk/rockchip/clk-rk3308.c

@@ -899,6 +899,7 @@ static const char *const rk3308_critical_clocks[] __initconst = {
 	"pclk_peri",
 	"hclk_audio",
 	"pclk_audio",
+	"sclk_ddrc",
 };
 
 static void __iomem *rk3308_cru_base;