board: ti: am43xx: take care of all OPPs

Make sure that all OPPs are checked on
scale_vcores(). While at that also fix 600MHz
VDD_MPU voltage according to AM437x Data Manual
available at [1].

Table 5-3 on that document, lists all valid
voltages per frequency.

[1] http://www.ti.com/lit/ds/symlink/am4379.pdf

Signed-off-by: Felipe Balbi <balbi@ti.com>

board/ti/am43xx/board.c

@@ -385,9 +385,18 @@ void scale_vcores(void)
 	case 1000:
 		mpu_vdd = TPS65218_DCDC_VOLT_SEL_1330MV;
 		break;
+	case 800:
+		mpu_vdd = TPS65218_DCDC_VOLT_SEL_1260MV;
+		break;
+	case 720:
+		mpu_vdd = TPS65218_DCDC_VOLT_SEL_1200MV;
+		break;
 	case 600:
 		mpu_vdd = TPS65218_DCDC_VOLT_SEL_1100MV;
 		break;
+	case 300:
+		mpu_vdd = TPS65218_DCDC_VOLT_SEL_0950MV;
+		break;
 	default:
 		puts("Unknown MPU clock, not scaling\n");
 		return;