Bring up the M5 port to a working stage: Extended numerous explicit checks for IAUDIO_X5 to also check for IAUDIO_M5, moved code around the target tree, added preliminary background for the sim.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@12610 a1c6a512-1295-4272-9138-f99709370657
27 files changed