Add Pinctrl driver for MediaTek MT8518 SoC.

Signed-off-by: mingming lee <mingming.lee@mediatek.com>

Fix the following warning when CONFIG_PINCONF=n:

drivers/pinctrl/mediatek/pinctrl-mtk-common.c:35:36:
warning: ‘mtk_drive’ defined but not used [-Wunused-const-variable=]
 static const struct mtk_drive_desc mtk_drive[] = {
                                    ^~~~~~~~~

Signed-off-by: Fabien Parent <fparent@baylibre.com>

Add Pinctrl driver for MediaTek MT8516 SoC.

Signed-off-by: Fabien Parent <fparent@baylibre.com>
Acked-by: Ryder Lee <ryder.lee@mediatek.com>

This patch adds pinctrl support for MT7623 SoC. And most of the
structures are used to hold the hardware configuration for each
pin.

Signed-off-by: Ryder Lee <ryder.lee@mediatek.com>
Tested-by: Matthias Brugger <matthias.bgg@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

This patch adds pinctrl support for MT7629 SoC. The IO core found on
the SoC has the registers for pinctrl, pinconf and gpio mixed up in
the same register range.  Hence the driver also implements the gpio
functionality through UCLASS_GPIO.

This also creates a common file as there might be other chips that use
the same binding and driver, then being a little more abstract could
help in the long run.

Signed-off-by: Ryder Lee <ryder.lee@mediatek.com>
Reviewed-by: Simon Glass <sjg@chromium.org>