Move the iriver-specific functions for detecting flashed
Rockbox/OF images into system-iriver.c and remove the
HAVE_FLASHED_ROCKBOX define which is now redundant (all
targets using system-iriver.c enable it).
Copyright attribution on the new system-iriver.h header
is a best guess from Git history.
Change-Id: If1933f881a63fd517162ab9ca8f4a3007b997739
Rockbox firmware has been flashed over original firmware (not yet
possible to do). Dircache & tagcache serialization for fast bootup
without the need to scan disk when Rockbox is in flash.
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@10464 a1c6a512-1295-4272-9138-f99709370657