s4-common: remap capacitive keys in CWM

Back = Back (unchanged)
Home = Down
App Switch = Select

Change-Id: I708b352eeed87e826dd7af0958356e09e1283b44
s4-common: Move custom recovery font to device trees

Change-Id: I52b036ba728c4a4c39e1621db76c681ee3c6fee4