LibBSD | bus_teardown_intr does not work on nexus bus (#13)

[Loris Nardo (@loris.nardo)]

Loris Nardo created an issue: https://gitlab.rtems.org/rtems/pkg/rtems-libbsd/-/issues/13



## Summary
To remove a registered interrupt handler from bus_setup_intr, I called the bus_teardown_intr function however the implementation of the teardown function for the nexus bus does install again the interrupt handler instead of removing it. This can be seen in the function `nexus_teardown_intr` at rtemsbsd/rtems/rtems-kernel-nexus.c. The function probably should also free the cookie that `nexus_setup_intr` has allocated 


## Steps to reproduce


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View it on GitLab: https://gitlab.rtems.org/rtems/pkg/rtems-libbsd/-/issues/13
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