`flashpage_write_raw()` got renamed to `flashpage_write()`. Now `sam0_flashpage_aux_write_raw()` is the only remaining 'raw' function, even though it behaves just like `flashpage_write()`. So let's also rename that for consistency.
`flashpage_write_raw()` got renamed to `flashpage_write()`. Now `sam0_flashpage_aux_write_raw()` is the only remaining 'raw' function, even though it behaves just like `flashpage_write()`. So let's also rename that for consistency.