pinctrl: realtek: add rtd1625 pinctrl driver

pinctrl: realtek: add rtd1625 pinctrl driver

Add support for Realtek RTD1625 SoC using the realtek common pinctrl driver.

This patch introduces the RTK_PIN_CONFIG_V2 and RTK_PIN_CONFIG_I2C macros,
which are required to describe the specific register layout and electrical
features (such as slew rate and high VIL) of the RTD1625 pins.

Signed-off-by: Tzuyi Chang <tychang@realtek.com>
Signed-off-by: Yu-Chun Lin <eleanor.lin@realtek.com>
Signed-off-by: Linus Walleij <linusw@kernel.org>