drm/i915/dsi: Prepare soc_gpio_set_value() to distinguish GPIO communities

Currently soc_gpio_set_value() supports only a single indexing for GPIO
pin.  For CHV case, for example, we will need to distinguish community
based index from the one that VBT is using. Introduce an additional
parameter to soc_gpio_set_value() and its callers.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Jani Nikula <jani.nikula@intel.com>
Tested-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231103201831.1037416-14-andriy.shevchenko@linux.intel.com