[Bug 235246] if_em init fails to allocate IRQ in 12.0-RELEASE

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=235246

            Bug ID: 235246
           Summary: if_em init fails to allocate IRQ in 12.0-RELEASE
           Product: Base System
           Version: 12.0-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: pr at aoek.com

Up to 11.2 this hardware was working OK:
none2 at pci0:11:0:0:      class=0x020000 card=0x84571043 chip=0x150c8086 rev=0x00
hdr=0x00
    vendor     = 'Intel Corporation'
    device     = '82583V Gigabit Network Connection'
    class      = network
    subclass   = ethernet

Since 12.0-RELEASE init is inable to allocate IRQ for rid:
em0: <Intel(R) PRO/1000 Network Connection> port 0xec00-0xec1f mem
0xfe9e0000-0xfe9fffff,0xfe9dc000-0xfe9dffff irq 17 at device 0.0 on pci11
em0: attach_pre capping queues at 1
em0: using 1024 tx descriptors and 1024 rx descriptors
em0: msix_init qsets capped at 1
em0: pxm cpus: 6 queue msgs: 0 admincnt: 1
em0: using 0 rx queues 0 tx queues 
em0: Using MSIX interrupts with 1 vectors
em0: allocated for 0 tx_queues
em0: allocated for 0 rx_queues
em0: failed to allocate IRQ for rid 0, name irq0.
em0: iflib_legacy_setup failed 12
device_attach: em0 attach returned 12

Latest GENERIC Kernel on amd64:
# uname -a
FreeBSD machine 12.0-RELEASE-p2 FreeBSD 12.0-RELEASE-p2 GENERIC  amd64


dmesg for 11.2 was:
em0: <Intel(R) PRO/1000 Network Connection 7.6.1-k> port 0xec00-0xec1f mem
0xfe9e0000-0xfe9fffff,0xfe9dc000-0xfe9dffff irq 17 at device 0.0 on pci11
em0: Using an MSI interrupt
em0: Ethernet address: bc:ae:c5:33:6d:98
em0: netmap queues/slots: TX 1/2048, RX 1/2048

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