* Clean up some keyboard/userspace code
* Rename `KEYBOARD_REPORT_BITS` -> `NKRO_REPORT_BITS`
* Add some missing includes
* Use `PACKED` define for report types
* Fix incorrect function signatures for FlexRAM EEPROM driver
* Rename `eeprom_stm32` to `eeprom_legacy_emulated_flash`.
* Rename `flash_stm32` to `legacy_flash_ops`.
* Rename `eeprom_teensy` to `eeprom_kinetis_flexram`.