Andrew Turner 224c3776f6 Add the start of INTRNG support for ACPI.
This adds a new acpi_bus interface with a map_intr method. This is similar
to the Open Firmware map_intr method and allows us to create the needed
mapping from ACPI space to INTRNG space.

Obtained from:	ABT Systems Ltd
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D8617
2018-01-11 17:09:12 +00:00
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