igd.asl rewrite

Old igd.asl had inconsistent addresses (between _DOD and actual device)
and ghost devices. Any of those is enough to make brightness on windows
fail and make igd.asl out-of-ACPI-spec. Also old code favoured ridiculous
copying of the same thing 6 times per chipset. Leave only hooking up and
chipset-specific part in chipset directory. Move NVS handling and ACPI-spec
parts to a common file.

Change-Id: I556769e5e28b83e7465e3db689e26c8c0ab44757
Signed-off-by: Vladimir Serbinenko <phcoder@gmail.com>
Reviewed-on: http://review.coreboot.org/7472
Tested-by: build bot (Jenkins)
Reviewed-by: Edward O'Callaghan <edward.ocallaghan@koparo.com>
Reviewed-by: Timothy Pearson <tpearson@raptorengineeringinc.com>

src/mainboard/packardbell/ms2290/acpi/ec.asl

@@ -121,12 +121,12 @@ Device(EC)
 	/* Decrease brightness.  */
 	Method(_Q1D, 0, NotSerialized)
 	{
-		\_SB.PCI0.GFX0.LCD0.DECB()
+		\_SB.PCI0.GFX0.DECB()
 	}
 	/* Increase brightness.  */
 	Method(_Q1C, 0, NotSerialized)
 	{
-		\_SB.PCI0.GFX0.LCD0.INCB()
+		\_SB.PCI0.GFX0.INCB()
 	}
 
 #include "battery.asl"

src/mainboard/packardbell/ms2290/acpi_tables.c

@@ -33,12 +33,5 @@
 
 void acpi_create_gnvs(global_nvs_t * gnvs)
 {
-	/* IGD Displays */
-	gnvs->ndid = 3;
-	gnvs->did[0] = 0x80000100;
-	gnvs->did[1] = 0x80000240;
-	gnvs->did[2] = 0x80000410;
-	gnvs->did[3] = 0x80000410;
-	gnvs->did[4] = 0x00000005;
 }
 

src/mainboard/packardbell/ms2290/devicetree.cb

@@ -20,6 +20,9 @@
 ##
 
 chip northbridge/intel/nehalem
+	# IGD Displays
+	register "gfx.ndid" = "3"
+	register "gfx.did" = "{ 0x80000100, 0x80000240, 0x80000410, 0x80000410, 0x00000005 }"
 
 	register "gpu_dp_b_hotplug" = "0x04"
 	register "gpu_dp_c_hotplug" = "0x04"

src/mainboard/packardbell/ms2290/dsdt.asl

@@ -18,8 +18,6 @@
  * Foundation, Inc.
  */
 
-#define HAVE_LCD_SCREEN 1
-
 DefinitionBlock(
 	"dsdt.aml",
 	"DSDT",