AWS Graviton [1234] systems have a bug in their ACPI where they mark
the PL061's GPIO pins as needing to be configured in PullUp mode (in
fact the PL061 has no pullup/pulldown resistors); this flag needs to
be removed in order for _AEI objects to be handled on these systems.
Reviewed by: Ali Saidi
MFC after: 1 week
Sponsored by: Amazon
Differential Revision: https://reviews.freebsd.org/D47239
2f3f867ac6