regulator: max20086: Fixes chip id and enable gpio

Merge series from João Paulo Gonçalves <jpaulo.silvagoncalves@gmail.com>:

I'm working on integrating a system with a MAX20086 and noticed these
small issues in the driver: the chip ID for MAX20086 is 0x30 and not
0x40. Also, in my use case, the enable pin is always enabled by
hardware, so the enable GPIO isn't needed. Without these changes, the
driver fails to probe.