pinctrl: ralink: rename MT7628(an) functions to MT76X8

pinctrl: ralink: rename MT7628(an) functions to MT76X8

BugLink: https://bugs.launchpad.net/bugs/1988479
[ Upstream commit 150438c86f55989632005b92c94f4aa2ec562ed6 ]

The functions that include "MT7628(an)" are for MT7628 and MT7688 SoCs.
Rename them to MT76X8 to refer to both of the SoCs.

Signed-off-by: Arınç ÜNAL <arinc.unal@arinc9.com>
Reviewed-by: Sergio Paracuellos <sergio.paracuellos@gmail.com>
Acked-by: Sergio Paracuellos <sergio.paracuellos@gmail.com>
Link: https://lore.kernel.org/r/20220414173916.5552-2-arinc.unal@arinc9.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>