RPP Library initalization rewritten.

RPP Library initalization rewritten.

There was only one function - rpp_init(), which initialized every
peripherals in the system, even if some of the peripherals were not
used by the software.

Now the rpp_init() is only convenient function and every needed
peripheral should be initialized by calling its own init function.
As a result, we were able to get rid of lots of ifdef and define
macros and resulting binary file is smaller.