RTEMS | bsps/aarch64: Add missing ISB after SCTLR write (!916)

[Preetam Das (@lostux)]

Preetam Das created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/916

Project:Branches: lostux/rtems:backport-5422-aarch64-isb to rtems/rtos/rtems:6
Author:   Preetam Das




## Summary

bsps/aarch64: Add missing ISB after SCTLR write

A write to the sctlr_el1 register is a 'context-changing operation' and thus requires a pipeline flush for the change to actually take effect on subsequent instructions.

The isb instruction gurantees this, and ensures mmu is enabled immediately.

Closes #5422

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View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/916
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