ddr: imx: Add 3600 MTps rate support

Add PLL settings for DDR 3600 MTps . This is very similar to 3200 MTps
PLL setting, except the divider is not 9 but 8 .

Signed-off-by: Marek Vasut <marex@denx.de>
Reviewed-by: Fabio Estevam <festevam@gmail.com>

drivers/ddr/imx/phy/ddrphy_utils.c

@@ -117,6 +117,10 @@ void ddrphy_init_set_dfi_clk(unsigned int drate)
 		dram_pll_init(MHZ(933));
 		dram_disable_bypass();
 		break;
+	case 3600:
+		dram_pll_init(MHZ(900));
+		dram_disable_bypass();
+		break;
 	case 3200:
 		dram_pll_init(MHZ(800));
 		dram_disable_bypass();