Fix kernel panic in LinuxKPI subsystem.

Approved by: so
Security: FreeBSD-EN-20:14.linuxpki

MFC r352207:
Use true and false when dealing with bool type in the LinuxKPI.
No functional change.

Sponsored by: Mellanox Technologies

MFC r352206:
Fix synchronous work drain issue in the LinuxKPI.

A work callback may restart itself. Loop in the drain function to see if the
work has been rescheduled and stop the subsequent reschedu

MFC r352206:
Fix synchronous work drain issue in the LinuxKPI.

A work callback may restart itself. Loop in the drain function to see if the
work has been rescheduled and stop the subsequent reschedules, if any.

Sponsored by: Mellanox Technologies

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MFC r346445: Enable ioremap for aarch64 in the LinuxKPI

Required for Mellanox drivers (e.g. on Ampere eMAG at Packet.com).

PR: 237055
Submitted by: Greg V <[email protected]>

MFC r347387:
Fix memory leak of PCI BUS structure in the LinuxKPI.

Sponsored by: Mellanox Technologies