Add support for MT2712 and MT7622. Due to register offset address of
pwm7 for MT2712 is not fixed 0x40, add mtk_pwm_reg_offset array for PWM
register offset.
Reviewed-by: NClaudiu Beznea <claudiu.beznea@microchip.com>
Reviewed-by: NMatthias Brugger <matthias.bgg@gmail.com>
Signed-off-by: NZhi Mao <zhi.mao@mediatek.com>
Signed-off-by: NThierry Reding <thierry.reding@gmail.com>