ddr: imx: Add new rates for i.MX91

iMX91 reuses iMX93 controller and PHY, but with lower speed,
so add new DDR rates for i.MX91.

Signed-off-by: Ye Li <ye.li@nxp.com>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
diff --git a/drivers/ddr/imx/phy/ddrphy_utils.c b/drivers/ddr/imx/phy/ddrphy_utils.c
index 14278f5..8e350de 100644
--- a/drivers/ddr/imx/phy/ddrphy_utils.c
+++ b/drivers/ddr/imx/phy/ddrphy_utils.c
@@ -144,6 +144,10 @@
 		dram_pll_init(MHZ(400));
 		dram_disable_bypass();
 		break;
+	case 1200:
+		dram_pll_init(MHZ(300));
+		dram_disable_bypass();
+		break;
 	case 1066:
 		dram_pll_init(MHZ(266));
 		dram_disable_bypass();
@@ -152,6 +156,10 @@
 		dram_pll_init(MHZ(233));
 		dram_disable_bypass();
 		break;
+	case 800:
+		dram_pll_init(MHZ(200));
+		dram_disable_bypass();
+		break;
 	case 667:
 		dram_pll_init(MHZ(167));
 		dram_disable_bypass();