pinctrl: ralink: include 'ralink_regs.h' in 'pinctrl-mt7620.c'

mt7620.h, included by pinctrl-mt7620.c, mentions MT762X_SOC_MT7628AN
declared in ralink_regs.h.

Fixes: 745ec436 ("pinctrl: ralink: move MT7620 SoC pinmux config into a new 'pinctrl-mt7620.c' file")
Cc: stable@vger.kernel.org
Signed-off-by: Luiz Angelo Daros de Luca <luizluca@gmail.com>
Signed-off-by: Sergio Paracuellos <sergio.paracuellos@gmail.com>
Link: https://lore.kernel.org/r/20211031064046.13533-1-sergio.paracuellos@gmail.com


Signed-off-by: Linus Walleij <linus.walleij@linaro.org>