soc/intel/broadwell/acpi: Rename `systemagent.asl`

Rename it to `hostbridge.asl`, which is what Haswell uses.

Change-Id: I6f97fc5c9459fe6b66dcfcf51900c751beda0ebe
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/46786
Reviewed-by: Michael Niewöhner <foss@mniewoehner.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/google/auron/dsdt.asl

@@ -24,7 +24,7 @@ DefinitionBlock(
 	Scope (\_SB) {
 		Device (PCI0)
 		{
-			#include <soc/intel/broadwell/acpi/systemagent.asl>
+			#include <soc/intel/broadwell/acpi/hostbridge.asl>
 			#include <soc/intel/broadwell/pch/acpi/pch.asl>
 			#include <drivers/intel/gma/acpi/default_brightness_levels.asl>
 		}

src/mainboard/google/jecht/dsdt.asl

@@ -25,7 +25,7 @@ DefinitionBlock(
 	Scope (\_SB) {
 		Device (PCI0)
 		{
-			#include <soc/intel/broadwell/acpi/systemagent.asl>
+			#include <soc/intel/broadwell/acpi/hostbridge.asl>
 			#include <soc/intel/broadwell/pch/acpi/pch.asl>
 		}
 	}

src/mainboard/intel/wtm2/dsdt.asl

@@ -25,7 +25,7 @@ DefinitionBlock(
 	Scope (\_SB) {
 		Device (PCI0)
 		{
-			#include <soc/intel/broadwell/acpi/systemagent.asl>
+			#include <soc/intel/broadwell/acpi/hostbridge.asl>
 			#include <soc/intel/broadwell/pch/acpi/pch.asl>
 		}
 	}

src/mainboard/purism/librem_bdw/dsdt.asl

@@ -21,7 +21,7 @@ DefinitionBlock(
 	Scope (\_SB) {
 		Device (PCI0)
 		{
-			#include <soc/intel/broadwell/acpi/systemagent.asl>
+			#include <soc/intel/broadwell/acpi/hostbridge.asl>
 			#include <soc/intel/broadwell/pch/acpi/pch.asl>
 		}
 	}