iwave/IWRainBowG6: Fix IASL warning and remark

- Add an empty Operating Region for the empty _REG method
- Serialize _CRS Method
- Remove Kconfig default disabling IASL warnings as errors

Fixes IASL Warning:
dsdt.aml   1362:  Method (_REG, 2)
Warning  3079 -             ^ _REG has no corresponding Operation Region

Fixes IASL remark:
dsdt.aml   1353:  Method (_CRS, 0)
Remark   2120 -             ^ Control Method should be made Serialized
(due to creation of named objects within)

Change-Id: Iff01613a6e3238469c1fcb8d74f5e98d18420aaf
Signed-off-by: Martin Roth <martinroth@google.com>
Reviewed-on: https://review.coreboot.org/12515
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
2 files changed