[Bug 279686] [asmc] [patch] Add support for MacBookPro 11.4

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=279686

            Bug ID: 279686
           Summary: [asmc] [patch] Add support for MacBookPro 11.4
           Product: Base System
           Version: 13.3-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: megamansec@gmail.com

Created attachment 251403
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=251403&action=edit
asmc macbookpro11,4 support

This patch adds support for asmc with the Macbookpro 11.4.

SMCs were (mostly) taken from https://logi.wiki/index.php/SMC_Sensor_Codes.

Three errors occur when running sysctl:
asmc0: asmc_key_read for key F1Sf failed 10 times, giving up
asmc0: asmc_key_read for key F0Sf failed 10 times, giving up
asmc0: asmc_key_read for key F0Sf failed 10 times, giving up

These correspond to:
dev.asmc.0.fan.1.safespeed
dev.asmc.0.fan.0.safespeed

but cannot be disabled without severely altering the driver, so I've left them
as-is.

Keyboard backlight is working nicely, and fan and temp reporting is also
working.

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