w1: add DS2501, DS2502, DS2505 EPROM device driver

Add a 1-Wire slave driver to support DS250x EPROM deivces. This
slave driver attaches the devices to the NVMEM subsystem for
an easy in-kernel usage.

Signed-off-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
Link: https://lore.kernel.org/r/20190831082623.15627-3-tbogendoerfer@suse.de


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>