Because we store some boot information (bootselect) data in the PCF8563
we need to modify the driver in a way that it does not reset the RTC
registers. However, we do not want to push this into the kernel so we
decided to create an out-of-tree fork.

Then, however, both drivers the in-kernel and out-of-tree driver
conflicting each other, and thus build the former as module and do not
load it by default.

BCS 746-000337