imx9: Add 233Mhz DDR PLL frequency

To support 1.866GTS LPDDR4x timing script, need to add 233Mhz freq
to DDR PLL for second mission point at 933MTS. Otherwise DDR training
will fail.

Reviewed-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Ye Li <ye.li@nxp.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>

drivers/ddr/imx/phy/ddrphy_utils.c

@@ -148,6 +148,10 @@ void ddrphy_init_set_dfi_clk(unsigned int drate)
 		dram_pll_init(MHZ(266));
 		dram_disable_bypass();
 		break;
+	case 933:
+		dram_pll_init(MHZ(233));
+		dram_disable_bypass();
+		break;
 	case 667:
 		dram_pll_init(MHZ(167));
 		dram_disable_bypass();