Do some adjustments to alleviate IRAM congestion on some targets from r30097. Include removing pointless IRAM declarations in pcmbuf.c because that callback code runs at a fairly relaxed pace. M5 is still the biggest problem.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@30100 a1c6a512-1295-4272-9138-f99709370657
4 files changed