Commit a92438c5a30a ("soc: mediatek: mtk-svs: Use bitfield access macros
where possible") introduced the use of FIELD_GET and FIELD_PREP macros,
which are defined in the bitfield header. Add an explicit include for it
so we're sure to have the symbols defined independently of the config.
Fixes: a92438c5a30a ("soc: mediatek: mtk-svs: Use bitfield access macros where possible")
Reported-by: kernel test robot <lkp@xxxxxxxxx>
Signed-off-by: Nícolas F. R. A. Prado <nfraprado@xxxxxxxxxxxxx>