Add defines for various FIRST PARTY DMA SEND subcommands.
Virtual machines can easily have more than 16 option ROMs and
when that happens, we happily access our resource array out of
bounds. Make sure we stay within the MAX_ROMS limit.
While here, bump MAX_ROMS from 16 to 32 to minimize the chance
of leaving option ROMs unaccounted for.

Obtained from:	Juniper Networks, Inc.