p880: Update recovery_keys.c

The default key mapping file in recovery is being updated to strip out
display_toggle and some ifs (see http://review.cyanogenmod.org/62724 ).
Technically the custom recovery keys file here shouldn't break
compilation, but this is a good oporunity to clean it up.

Change-Id: I2ebd6aa0ed444148f3f4e2df05edd8c73d9dabac