Add a header for the i8259A register definitions. This is based on
additions to sys/amd64/isa/icu.h from PIIX4 and other datasheets. I
tweaked a few comments based on the NetBSD header of the same name when I
merged the constants to sys/i386/isa/icu.h, but the vast majority of this
file was created independently by Peter and not taken from any existing
files.
Submitted by: peter
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