ec/lenovo/h8: Allow control of low-battery beep.

Change-Id: I2f422e83f2afcf0cc3f3ecbace01a8f4f39e87d4
Signed-off-by: Vladimir Serbinenko <phcoder@gmail.com>
Reviewed-on: http://review.coreboot.org/4663
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>

src/ec/lenovo/h8/h8.c

@@ -178,6 +178,16 @@ static void h8_enable(device_t dev)
 		beepmask0 = 0x00;
 		beepmask1 = 0x00;
 	}
+
+	if (conf->has_power_management_beeps) {
+		if (get_option(&val, "low_battery_beep") != CB_SUCCESS)
+			val = 1;
+		if (val)
+			beepmask0 |= 2;
+		else
+			beepmask0 &= ~2;
+	}
+
 	ec_write(H8_SOUND_ENABLE0, beepmask0);
 	ec_write(H8_SOUND_ENABLE1, beepmask1);