pinctrl: s32cc: implement GPIO functionality

The updated SIUL2 block groups pinctrl, GPIO data access
and interrupt control within the same hardware unit.
The SIUL2 driver is therefore structured as a monolithic
pinctrl/GPIO driver.

GPIO data access and direction handling are implemented using the
gpio-regmap library backed by a virtual regmap. The virtual regmap
translates the gpio-regmap register model to the underlying SIUL2
registers: MSCR for direction, PGPDI for input values and PGPDO for
output values.

The existing pinctrl GPIO callbacks are used for the request/free path:
they switch the pad to GPIO mode on request and restore the previous
MSCR configuration when the GPIO is released.

This change came as a result of upstream review in the
following series:
https://lore.kernel.org/linux-gpio/20260120115923.3463866-4-khristineandreea.barbulescu@oss.nxp.com/T/#m543c9edbdde74bdc68b6a2364e8b975356c33043
https://lore.kernel.org/all/20260504131148.3622697-7-khristineandreea.barbulescu@oss.nxp.com/

Support both SIUL2 DT layouts:
- legacy pinctrl-only binding
- extended pinctrl/GPIO/irqchip binding

Reviewed-by: Linus Walleij <linusw@kernel.org>
Signed-off-by: Andrei Stefanescu <andrei.stefanescu@oss.nxp.com>
Signed-off-by: Khristine Andreea Barbulescu <khristineandreea.barbulescu@oss.nxp.com>
Reviewed-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>
Link: https://lore.kernel.org/linux-gpio/20260120115923.3463866-4-khristineandreea.barbulescu@oss.nxp.com/T/#m543c9edbdde74bdc68b6a2364e8b975356c33043
Link: https://lore.kernel.org/all/20260504131148.3622697-7-khristineandreea.barbulescu@oss.nxp.com/
Signed-off-by: Linus Walleij <linusw@kernel.org>

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