LibBSD | pci: Add zynqmp pcib support (!146)

[Aaron Nyholm (@eagleirony)]

Aaron Nyholm commented on a discussion on freebsd/sys/dev/pci/pci_host_generic.c: https://gitlab.rtems.org/rtems/pkg/rtems-libbsd/-/merge_requests/146#note_152257

 >  /* Generic ECAM PCIe driver */
 >  
 >  #include <sys/cdefs.h>
 > -#include "opt_platform.h"
 > +#include <rtems/bsd/local/opt_platform.h>

This change is inline with the instructions in CONTRIBUTING, 
```
The FreeBSD build and configuration system uses option header files, e.g.
#include "opt_xyz.h" in an unmodified FreeBSD file.  This include is
transformed by the import script into #include <rtems/bsd/local/opt_xyz.h>.  Do
not disable option header includes via guards.  Instead, add an empty option
header, e.g. touch rtemsbsd/include/rtems/bsd/local/opt_xyz.h.\
```
See other examples like: https://gitlab.rtems.org/rtems/pkg/rtems-libbsd/-/blob/7-freebsd-14/freebsd/sys/dev/sdhci/sdhci.c?ref_type=heads#L66

Another item that is changed in the files without `ifdefs` are the `#include <machine/rtems-bsd-kernel-space.h>` at the top of files. I actually agree with you that it would be beneficial to be changed to use `#ifndef __rtems__` to make it so no changes to the original source are made. But as it stands this is the current contributing style and changing that is outside the scope of this MR.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/pkg/rtems-libbsd/-/merge_requests/146#note_152257
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