regulator: make the subsystem aware of shared GPIOs

regulator: make the subsystem aware of shared GPIOs

GPIOLIB is now aware of shared GPIOs and - for platforms where access to
such pins is managed internally - we don't need to keep track of the
enable count.

Once all users in the kernel switch to using the new mechanism, we'll be
able to drop the internal counting of users from the regulator code.

Acked-by: Mark Brown <broonie@kernel.org>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Link: https://patch.msgid.link/20251112-gpio-shared-v4-10-b51f97b1abd8@linaro.org
Signed-off-by: Mark Brown <broonie@kernel.org>