* Bind smartfs0 to LUN 0 instead of mmcsd0
* Use USB composite code from similar boards
* Pull in CDC/ACM code as well
boards/stm32f411-minimum: composite: style refactor
* Unalign `int strbase = ` text, use single spaces
* Rename `int n` to `int dev_idx` like in newer `_composite.c` board code
* Add composite defconfig with CDC/ACM and MSC for build-testing
