The GPIO APIs for ypr0 and ypr1 targets was messy, requiring a
direct communication via several ioctls calls.
Since it is planned to add support to other devices, more GPIO are
going to be used. For that reason the functions shall be clear and
easy to use.
Change-Id: Ia2304335e1fed1305cc2c4320bd4c097e13079be
This patch includes some refactoring:
- renaming according to Rockbox guidelines
- GPIO code merging, still with target defines
- some simplification in firmware/SOURCES
Change-Id: I7fd95aece53f40efdf8caac22348376615795431