[Bug 262875] em(4) driver fails to attach on Dell Latitude 5520 0A21

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=262875

            Bug ID: 262875
           Summary: em(4) driver fails to attach on Dell Latitude 5520
                    0A21
           Product: Base System
           Version: 13.0-RELEASE
          Hardware: arm64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: gcr@tharned.org

Created attachment 232768
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=232768&action=edit
Diagnostic output for Dell Latitude 5520 0A21

At boot, dmesg(8) reports:
pci0: <network, ethernet> at device 31.6 (no driver attached)

pciconf(8) indicates that this laptop has an Intel I219-LM NIC:
none9@pci0:0:31:6:      class=0x020000 rev=0x20 hdr=0x00 vendor=0x8086
device=0x15fb subvendor=0x1028 subdevice=0x0a21
    vendor     = 'Intel Corporation'
    device     = 'Ethernet Connection (13) I219-LM'
    class      = network
    subclass   = ethernet
    cap 01[c8] = powerspec 3  supports D0 D3  current D0
    cap 05[d0] = MSI supports 1 message, 64 bit 

dmidecode(8) indicates that the device is disabled, yet according to the BIOS
settings it is in fact enabled:
Handle 0x2901, DMI type 41, 11 bytes
Onboard Device
        Reference Designation:  
        Type: Ethernet
        Status: Disabled
        Type Instance: 0
        Bus Address: 0000:00:1f.6

According to Intel, this NIC should be supported by the em(4) driver
<https://www.intel.com/content/www/us/en/products/sku/82185/intel-ethernet-connection-i219lm/downloads.html>.
FWIW, the NIC probes, attaches, and operates under Fedora 35 without any
issues.

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