RTEMS | Deprecate or1k in RTEMS 7 (#5321)

[Joel Sherrill (@joel)]

Joel Sherrill created an issue: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5321

Assignee: Joel Sherrill

## Summary
The or1k RTEMS port does not appear to have any users. It has [14 issues](https://gitlab.rtems.org/groups/rtems/-/issues/?sort=created_date&state=opened&search=or1k&first_page_size=20) many of which are old. One of those is that the port does not appear to have proper interrupt support. I can confirm this because hello runs on qemu but ticker hangs.

Proposal is to deprecate in 7 and remove in 8.

## Steps to reproduce


### Pre-set options

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