move gpio impls in subdir, remove unused impls #2039

	on:
	push:
	branches: [ staging, trying, master ]
	pull_request:

	name: Clippy check
	jobs:
	clippy_check:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v3
	- name: Use the latest stable rustc
	run: rustup update stable && rustup default stable
	- name: Add Cortex-M4F target
	run: rustup target add thumbv7em-none-eabihf

	- name: Cache Dependencies
	uses: Swatinem/rust-cache@v2
	with:
	key: v0.16.0

	- uses: actions-rs/clippy-check@v1
	with:
	token: ${{ secrets.GITHUB_TOKEN }}
	args: --examples --features=stm32f479,usb_fs,sdio-host

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