lenovo/t520: Apply ME workaround for S3 resume

Without this patch the laptop powers down after resume.

Change-Id: Ic6486fd4c4cc55b1ac5695f9d6d83fc2193b7eba
Signed-off-by: Nicolas Reinecke <nr@das-labor.org>
Reviewed-on: http://review.coreboot.org/7102
Tested-by: build bot (Jenkins)
Reviewed-by: Vladimir Serbinenko <phcoder@gmail.com>

src/mainboard/lenovo/t520/acpi/platform.asl

@@ -68,6 +68,10 @@ Method(_PTS,1)
 
 Method(_WAK,1)
 {
+	/* ME may not be up yet. */
+	Store (0, \_TZ.MEB1)
+	Store (0, \_TZ.MEB2)
+
 	/* Not implemented. */
 	Return(Package(){0,0})
 }

src/mainboard/lenovo/t520/dsdt.asl

@@ -24,6 +24,7 @@
 #define BRIGHTNESS_DOWN \_SB.PCI0.GFX0.LCD0.DECB
 #define ACPI_VIDEO_DEVICE \_SB.PCI0.GFX0
 #define RP04_IS_EXPRESSCARD 1
+#define EC_LENOVO_H8_ME_WORKAROUND 1
 #define HAVE_LCD_SCREEN 1
 
 DefinitionBlock(