[Bug 230428] No battery detected on Thinkpad x230 with coreboot bios

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=230428

            Bug ID: 230428
           Summary: No battery detected on Thinkpad x230 with coreboot
                    bios
           Product: Base System
           Version: CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: misc
          Assignee: bugs at FreeBSD.org
          Reporter: aliovx at gmail.com

This machine has been running well on FreeBSD with the stock bios. I decided to
flash coreboot 4.8.1 to get rid of the wireless card whitelist, so I can
install any card I want. Also I've got rid of Intel ME. 

FreeBSD Current does not detect the battery, dmesg | grep ACPI gives the
following

ACPI APIC Table: <CORE   COREBOOT>
ACPI Error: No handler for Region [ERAM] (0xfffff80003672200) [EmbeddedControl]
(20180629/evregion-288)
ACPI Error: Region EmbeddedControl (ID=3) has no handler (20180629/exfldio-428)
ACPI Error: Method parse/execution failed \134_SB.PCI0.LPCB.EC.BAT0._STA,
AE_NOT_EXIST (20180629/psparse-677)
ACPI Error: No handler for Region [ERAM] (0xfffff80003672200) [EmbeddedControl]
(20180629/evregion-288)
ACPI Error: Region EmbeddedControl (ID=3) has no handler (20180629/exfldio-428)
ACPI Error: Method parse/execution failed \134_SB.PCI0.LPCB.EC.BAT1._STA,
AE_NOT_EXIST (20180629/psparse-677)

For info, a debian live bootable image detects the battery with no issue.

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