RTEMS | MicroBlaze interrupts cleanup before enabling MER (!845)

[Sam Price (@TheSamPrice)]

Sam Price created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/845

Project:Branches: TheSamPrice/rtems:feature/microblaze-irq-handler to rtems/rtos/rtems:main
Author:   Sam Price




## Summary

This could use some very careful review.

We have been running with the following

```
	/* Subtract stack frame */
	addik r1, r1, -(CPU_INTERRUPT_FRAME_SIZE)

	swi r5, r1, 8

	/* Indicate unknown interrupt source */
        /* GSFC: Switch addi -> addik to not corrupt msr. */
	addik r5, r0, 0xFF

	braid _ISR_Handler

```

Going to follow up with some more comments on this one.

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