rockchip: rk322x: add CLK_EMMC_SAMPLE clock support

Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/drivers/clk/rockchip/clk_rk322x.c b/drivers/clk/rockchip/clk_rk322x.c
index 48ed14b..4b599fb 100644
--- a/drivers/clk/rockchip/clk_rk322x.c
+++ b/drivers/clk/rockchip/clk_rk322x.c
@@ -217,6 +217,7 @@
 	switch (periph) {
 	case HCLK_EMMC:
 	case SCLK_EMMC:
+	case SCLK_EMMC_SAMPLE:
 		con = readl(&cru->cru_clksel_con[11]);
 		mux = (con & EMMC_PLL_MASK) >> EMMC_PLL_SHIFT;
 		con = readl(&cru->cru_clksel_con[12]);
@@ -293,6 +294,7 @@
 	switch (periph) {
 	case HCLK_EMMC:
 	case SCLK_EMMC:
+	case SCLK_EMMC_SAMPLE:
 		rk_clrsetreg(&cru->cru_clksel_con[11],
 			     EMMC_PLL_MASK,
 			     mux << EMMC_PLL_SHIFT);