pinctrl: cy8c95x0: Use single I2C lock

Currently there are 3 locks being used when accessing the chip, one
in the driver and one in each regmap. Reduce that to one driver only
lock that protects all regmap and regcache accesses.

Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Reviewed-by: Andy Shevchenko <andy@kernel.org>
Link: https://lore.kernel.org/r/20240521152602.1097764-1-patrick.rudolph@9elements.com


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