mpsutil/mprutil: add flash subcommand
the flash subcommand allows to save/update firmware and bios for LSI Fusion-MPT 2/3 controllers (mps(4) and mpr(4))
Tested by: allanjude Reviewed by: wblock (manpage) Relnotes: yes Sponsored by: Gandi.net Differential Revision: https://reviews.freebsd.org/D4026
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