RTEMS | bsps/aarch64: Add isb instruction after write to sctlr_el1 in aarch64_mmu_enable (!908)

[Preetam Das (@lostux)]

Preetam Das created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/908

Project:Branches: lostux/rtems:bsps-aarch64-add-isb-after-mmu-enable to rtems/rtos/rtems:main
Author:   Preetam Das




## Summary

bsps/aarch64: Add isb instruction after write to sctlr_el1 in aarch64_mmu_enable

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.


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