mb/purism/librem_skl: Clean up dsdt.asl

Move includes using library paths to the top and remove unnecessary
comments. Also, get rid of that unnecessary _SB scope. Use an absolute
path for the PCI0 device instead.

Change-Id: I2c4fb1933eda2eb75bfe9181f13e189ec66cadf9
Signed-off-by: Felix Singer <felixsinger@posteo.net>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/57849
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Matt DeVillier <matt.devillier@gmail.com>
GitOrigin-RevId: 9af3de12f6fafa6c0ea67bed33952fc9b43c2bcc
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/coreboot/+/3193633
Tested-by: Copybara Service <copybara-worker-blackhole@google.com>
Reviewed-by: Nick Vaccaro <nvaccaro@google.com>
Commit-Queue: Nick Vaccaro <nvaccaro@google.com>
diff --git a/src/mainboard/purism/librem_skl/dsdt.asl b/src/mainboard/purism/librem_skl/dsdt.asl
index f9343a8..43c8e7f 100644
--- a/src/mainboard/purism/librem_skl/dsdt.asl
+++ b/src/mainboard/purism/librem_skl/dsdt.asl
@@ -11,26 +11,17 @@
 )
 {
 	#include <acpi/dsdt_top.asl>
-	#include <soc/intel/common/block/acpi/acpi/platform.asl>
-
-	// global NVS and variables
-	#include <soc/intel/skylake/acpi/globalnvs.asl>
-
-	// CPU
 	#include <cpu/intel/common/acpi/cpu.asl>
-
-	Scope (\_SB) {
-		Device (PCI0)
-		{
-			#include <soc/intel/skylake/acpi/systemagent.asl>
-			#include <soc/intel/skylake/acpi/pch.asl>
-			#include <drivers/intel/gma/acpi/default_brightness_levels.asl>
-		}
-
-	}
-
+	#include <soc/intel/common/block/acpi/acpi/platform.asl>
+	#include <soc/intel/skylake/acpi/globalnvs.asl>
 	#include <southbridge/intel/common/acpi/sleepstates.asl>
 
-	// Mainboard specific
+	Device (\_SB.PCI0)
+	{
+		#include <soc/intel/skylake/acpi/systemagent.asl>
+		#include <soc/intel/skylake/acpi/pch.asl>
+		#include <drivers/intel/gma/acpi/default_brightness_levels.asl>
+	}
+
 	#include "acpi/mainboard.asl"
 }