iavf: fix hang on reboot with ice

Issue

• System randomly hangs on shutdown with:

        PID: 1        TASK: ffff965400e5a340  CPU: 24   COMMAND: "systemd-shutdow"
          #0 [ffffaad04005fa50] __schedule at ffffffff8b3239cb
          #1 [ffffaad04005fae8] schedule at ffffffff8b323e2d
          #2 [ffffaad04005fb00] schedule_hrtimeout_range_clock at ffffffff8b32cebc
          #3 [ffffaad04005fb80] usleep_range_state at ffffffff8b32c930
          #4 [ffffaad04005fbb0] iavf_remove at ffffffffc12b9b4c [iavf]
          #5 [ffffaad04005fbf0] pci_device_remove at ffffffff8add7513
          #6 [ffffaad04005fc10] device_release_driver_internal at ffffffff8af08baa
          #7 [ffffaad04005fc40] pci_stop_bus_device at ffffffff8adcc5fc
          #8 [ffffaad04005fc60] pci_stop_and_remove_bus_device at ffffffff8adcc81e
          #9 [ffffaad04005fc70] pci_iov_remove_virtfn at ffffffff8adf9429
         #10 [ffffaad04005fca8] sriov_disable at ffffffff8adf98e4
         #11 [ffffaad04005fcc8] ice_free_vfs at ffffffffc04bb2c8 [ice]
         #12 [ffffaad04005fd10] ice_remove at ffffffffc04778fe [ice]
         #13 [ffffaad04005fd38] ice_shutdown at ffffffffc0477946 [ice]
         #14 [ffffaad04005fd50] pci_device_shutdown at ffffffff8add58f1
         #15 [ffffaad04005fd70] device_shutdown at ffffffff8af05386
         #16 [ffffaad04005fd98] kernel_restart at ffffffff8a92a870
         #17 [ffffaad04005fda8] __do_sys_reboot at ffffffff8a92abd6
         #18 [ffffaad04005fee0] do_syscall_64 at ffffffff8b317159
         #19 [ffffaad04005ff08] __context_tracking_enter at ffffffff8b31b6fc
         #20 [ffffaad04005ff18] syscall_exit_to_user_mode at ffffffff8b31b50d
         #21 [ffffaad04005ff28] do_syscall_64 at ffffffff8b317169
         #22 [ffffaad04005ff50] entry_SYSCALL_64_after_hwframe at ffffffff8b40009b