soc: mediatek: mtk-infracfg: Fix kerneldoc

soc: mediatek: mtk-infracfg: Fix kerneldoc

Fix W=1 compile warnings (invalid kerneldoc):

    drivers/soc/mediatek/mtk-infracfg.c:34: warning: Function parameter or member 'infracfg' not described in 'mtk_infracfg_set_bus_protection'
    drivers/soc/mediatek/mtk-infracfg.c:34: warning: Excess function parameter 'regmap' description in 'mtk_infracfg_set_bus_protection'

Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Link: https://lore.kernel.org/r/20200729074415.28393-1-krzk@kernel.org
Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>