Remove $FreeBSD$: alt two-line .c pattern

Remove /^\s*__RCSID\("\$FreeBSD\$"\);\n\n/

Fix formatting of the usage() output

mprutil: add big endian support

This fix mprutil on big endian platforms, as follow up of D25785.

Flash operations are still not working, such as MPI2_FUNCTION_FW_UPLOAD
failing due to timeout.

Firmware version used during tests: 16.00.01.00

Submitted by: Andre Fernando da Silva <andre.silva@eldorado.org.br>
Reviewed by: luporl, Sreekanth Reddy <sreekanth.reddy@broadcom.com> (by e-mail)
Sponsored by: Eldorado Research Institute (eldorado.org.br)
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D26040

mpsutil slot set status

This code has been written as a proof of concept, but I think that it
can be useful in general. It allows to set the status of an enclosure
slot. Practically, this means controlling whatever slot status LEDs the
enclosure provides. At present, the new command does not have sanity
checks or any conveniences. That means that it is possible to issue the
command for an invalid slot and an enclosure. But the worst I have seen
happening is either the command failing or simply being ignored. Also,
at the moment, the status has to be specified as a numeric bit mask.
The bit definitions can be found in sys/dev/mps/mpi/mpi2_init.h, they
are prefixed with MPI2_SEP_REQ_SLOTSTATUS_. The only way to address a
slot is by the enclosure handle and the slot number. Both are readily
available from mpsutil show commands.

So, future enhancements could include alternative ways to address a slot
(e.g., by a disk handle or a disk device name) and human friendly names
for slot statuses.

The new command is useful alternative to 'sas2ircu locate' command.
First, sas2ircu is a proprietary blob. Second, it supports setting only
locate / identify status bit.

Tested on HP H220 running LSI IT firmware 20.x.

Reviewed by: bapt
MFC after: 3 weeks
Differential Revision: https://reviews.freebsd.org/D20535