regulator: max20086: Change enable gpio to optional

commit e8ac7336 upstream.

The enable pin can be configured as always enabled by the hardware. Make
the enable gpio request optional so the driver doesn't fail to probe
when `enable-gpios` property is not present in the device tree.

Cc: stable@vger.kernel.org
Fixes: bfff546a ("regulator: Add MAX20086-MAX20089 driver")
Signed-off-by: João Paulo Gonçalves <jpaulo.silvagoncalves@gmail.com>
Link: https://patch.msgid.link/20250420-fix-max20086-v1-2-8cc9ee0d5a08@gmail.com


Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>