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>
3 files changed