Add support for simulator self-update test

[bigbrett]

No description provided.

[Copilot]

Pull request overview

This PR adds support for testing bootloader self-update functionality in the simulator environment. The self-update feature allows wolfBoot to update itself in RAM, which requires special handling in the simulator since flash memory is memory-mapped at runtime rather than at linker-time addresses.

Key changes:

• Added simulator-specific self-update test that verifies the bootloader can update itself by swapping a dummy payload to the bootloader region
• Implemented conditional logic in the self-update code to use runtime flash offsets instead of linker symbols when running in the simulator
• Added arch_reboot() implementation for the simulator to properly exit after self-update

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 9 comments.

Show a summary per file

File	Description
tools/test.mk	Adds test-sim-self-update target that creates a dummy bootloader update, assembles flash partitions, runs the simulator, and verifies the update was applied correctly
src/update_flash.c	Adds ARCH_SIM conditional compilation to use ARCH_FLASH_OFFSET instead of _start_text linker symbol for flash writes in both EXT_FLASH and internal flash code paths
hal/sim.c	Implements arch_reboot() function that calls exit(0) to terminate the simulator after self-update
config/examples/sim-self-update.config	Provides configuration for simulator self-update testing with appropriate partition sizes and addresses
.github/workflows/test-sim-self-update.yml	Adds CI workflow to automatically run the self-update test on ubuntu-latest with sources.list workaround for reliability

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