superio/acpi: Make _CRS methods Serialized, eliminating IASL remarks

When compiling for the ASUS P8H61-M LX, IASL 20180531 emits the
following remark: "Control Method should be made Serialized (due to
creation of named objects within)". Making the appropriate methods
Serialized eliminates these remarks.

Change-Id: I8e95d9a00a629a2f904c79b78fac20810327ed37
Signed-off-by: Tristan Corrick <tristan@corrick.kiwi>
Reviewed-on: https://review.coreboot.org/27796
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/superio/acpi/pnp_generic.asl b/src/superio/acpi/pnp_generic.asl
index c878827..980404e 100644
--- a/src/superio/acpi/pnp_generic.asl
+++ b/src/superio/acpi/pnp_generic.asl
@@ -95,7 +95,7 @@
 	}
 #endif
 
-	Method (_CRS)
+	Method (_CRS, 0, Serialized)
 	{
 		Name (CRS, ResourceTemplate () {
 #ifdef SUPERIO_PNP_IO0
diff --git a/src/superio/acpi/pnp_kbc.asl b/src/superio/acpi/pnp_kbc.asl
index db81ea2..cbcfd55 100644
--- a/src/superio/acpi/pnp_kbc.asl
+++ b/src/superio/acpi/pnp_kbc.asl
@@ -73,7 +73,7 @@
 		PNP_DEFAULT_PSC
 	}
 
-	Method (_CRS)
+	Method (_CRS, 0, Serialized)
 	{
 		Name (CRS, ResourceTemplate () {
 			IO (Decode16, 0x0000, 0x0000, 0x01, 0x01, IO0)
@@ -133,7 +133,7 @@
 		Return (^^SUPERIO_ID(KBD, SUPERIO_KBC_LDN)._PSC ())
 	}
 
-	Method (_CRS)
+	Method (_CRS, 0, Serialized)
 	{
 		Name (CRS, ResourceTemplate () {
 			IRQNoFlags (IR1) {}
@@ -188,7 +188,7 @@
 		PNP_DEFAULT_PSC
 	}
 
-	Method (_CRS)
+	Method (_CRS, 0, Serialized)
 	{
 		Name (CRS, ResourceTemplate () {
 			IRQNoFlags (IR1) {}
diff --git a/src/superio/acpi/pnp_uart.asl b/src/superio/acpi/pnp_uart.asl
index 1bbdb37..f42cc42 100644
--- a/src/superio/acpi/pnp_uart.asl
+++ b/src/superio/acpi/pnp_uart.asl
@@ -79,7 +79,7 @@
 	}
 #endif
 
-	Method (_CRS)
+	Method (_CRS, 0, Serialized)
 	{
 		Name (CRS, ResourceTemplate () {
 			IO (Decode16, 0x0000, 0x0000, 0x08, 0x08, IO0)