add stm32mp157f

[liamHowatt]

Summary by cubic

Adds STM32MP157F-DK2 board support for lv_port_linux. Includes setup for Wayland, SDL, and DRM backends, build/run instructions, and Project Creator metadata so users can run LVGL on ST’s MP1 devkit.

• New Features
  • Added boards/stm32mp157f-dk with README: hardware/software setup, SDK activation, updated Wayland build command, driver backends (Wayland/SDL/DRM-egl-2d), run flags (-m/-f), gdbserver notes, and benchmarks.
  • Added manifest.json for Project Creator (board specs, image, buy links, branches, get-started).
  • Added board image (stm32mp157f-dk.avif).
  • Updated root README to list STM32MP157F-DK2.

^{Written for commit 427916a. Summary will update on new commits.}

[kisvegabor]

@AndreCostaaa
I'm about to publish the video, so this PR needs to be merged.

Also: is it Yocto? If so we need to tell it in the README.

[AndreCostaaa]

It is yocto based but ST provides a default ready to install image and SDK, no need to build it

[cubic-dev-ai]

1 issue found across 4 files

Prompt for AI agents (unresolved issues)

Check if these issues are valid — if so, understand the root cause of each and fix them. If appropriate, use sub-agents to investigate and fix each issue separately.


<file name="boards/stm32mp157f-dk/README.md">

<violation number="1" location="boards/stm32mp157f-dk/README.md:132">
P2: Wayland SSH run instructions omit required session environment variables, which can cause `lvglsim` to fail to connect to the compositor.</violation>
</file>

_{Reply with feedback, questions, or to request a fix. Tag @cubic-dev-ai to re-run a review.}

[cubic-dev-ai]

P2: Wayland SSH run instructions omit required session environment variables, which can cause lvglsim to fail to connect to the compositor.

Prompt for AI agents

Check if this issue is valid — if so, understand the root cause and fix it. At boards/stm32mp157f-dk/README.md, line 132:

<comment>Wayland SSH run instructions omit required session environment variables, which can cause `lvglsim` to fail to connect to the compositor.</comment>

<file context>
@@ -0,0 +1,173 @@
+```
+On the board, run the binary:
+```shell
+./lvglsim -m
+```
+
</file context>

Suggested change

	./lvglsim -m
	XDG_RUNTIME_DIR=/run/user/1000 WAYLAND_DISPLAY=wayland-1 ./lvglsim -m