Fix three IASL warnings in ASL utility code by making the
methods `GWBM`, `GWEM` and `GIOR` serialized.
TEST: Built and booted on ASUS KFSN4-DRE.
Change-Id: Ia98088bea7e3e21c33252c98a675799d52edb809
Signed-off-by: Timothy Pearson <tpearson@raptorengineeringinc.com>
Reviewed-on: http://review.coreboot.org/8264
Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Tested-by: build bot (Jenkins)
8d9492e536