freebsd_network: Adaptations in preparation for the OpenBSD layer.

Most of these changes however add things that FreeBSD has (with a few
exceptions noted in comments) which the OpenBSD shim layer merely needs
to make use of.

(FreeBSD used to have support for IFF_NEEDSGIANT but removed it. The
support instated here is very similar to what FreeBSD used to have.)

freebsd_network: Add some missing __BEGIN_DECLS/__END_DECLS.

freebsd11_network -> freebsd_network.

FreeBSD 12 has no major changes to the ifnet KPIs that constitute a
source compatibility break, save a single one related to locking
which doesn't really apply to us, and so we don't need to create
a "freebsd12_network" directory to work through the upgrades.

Don't include sys/system.h. This avoids header recursions (the header guards kept us safe). CID 4865, CID 4894.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@39968 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Changing the naming scheme for firmwares. Instead of directly renaming
the respective firmware files renaming is now done within the firmware loader.
The mapping of original firmware names to FreeBSD internal firmware names is
now done within driver specific settings files. Those are committed in a next
step.
This approach allows a clean separation of FreeBSD compat layer requirements
and native driver requirements.
For example: we have two Intel PRO/Wireless 2100 drivers. Do we prefer the
naming scheme of the native driver or do we force the native driver to use
the one of the FreeBSD driver? With this commit we prefer native over FreeBSD.
* Changed the firmware loader to make use of Haiku's file mapping facility.
* Implementing firmware unloading.
* Some minor cleanups in two compat layer header files, which are using Haiku
defined identifiers, where apropriate.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@35156 a95241bf-73f2-0310-859d-f6bbb57e9c96

* reordering of headerfile inclusion to comply to FreeBSD 8
ordering.
this makes porting driver (especially wifi ones) more
convinient
* based on FreeBSD svn revision 196691

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@33739 a95241bf-73f2-0310-859d-f6bbb57e9c96

Don't include sys/system.h. This avoids header recursions (the header guards kept us safe). CID 4865, CID 4894.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@39968 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Changing the naming scheme for firmwares. Instead of directly renaming
the respective firmware files renaming is now done within the firmware loader.
The mapping of original firmware names to FreeBSD internal firmware names is
now done within driver specific settings files. Those are committed in a next
step.
This approach allows a clean separation of FreeBSD compat layer requirements
and native driver requirements.
For example: we have two Intel PRO/Wireless 2100 drivers. Do we prefer the
naming scheme of the native driver or do we force the native driver to use
the one of the FreeBSD driver? With this commit we prefer native over FreeBSD.
* Changed the firmware loader to make use of Haiku's file mapping facility.
* Implementing firmware unloading.
* Some minor cleanups in two compat layer header files, which are using Haiku
defined identifiers, where apropriate.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@35156 a95241bf-73f2-0310-859d-f6bbb57e9c96

* reordering of headerfile inclusion to comply to FreeBSD 8
ordering.
this makes porting driver (especially wifi ones) more
convinient
* based on FreeBSD svn revision 196691

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@33739 a95241bf-73f2-0310-859d-f6bbb57e9c96