Adding tracepoints to inline functions adds tracepoint invocation code
for each instance where the function is inlined. The resulting increase
in kernel code size can have negative impact:
 - More cache misses in instruction cache
 - Reduced amount of DMA-capable memory

Therefore change all functions implementing I/O instructions from inline
to normal functions.

Bloat-o-meter summary after change (using performance_defconfig):

  add/remove: 24/2 grow/shrink: 4/39 up/down: 2205/-4858 (-2653)
Signed-off-by: Peter Oberparleiter <oberpar@linux.vnet.ibm.com>
Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>