score: Add --enable-profiling configure option
sapi: Add profiling application level support
sapi: Add per-CPU profiling application level data
sapi: Add SMP lock profiling app. level data
score: Add per-CPU profiling

Add per-CPU profiling stats API.  Implement the thread dispatch disable
level profiling.  The interrupt profiling must be implemented in CPU
port specific parts (mostly assembler code).  Add a support function
_Profiling_Outer_most_interrupt_entry_and_exit() for this purpose.
score: Add SMP lock profiling support
sparc: Add support for interrupt profiling
bsps/leon3: Add interrupt delay profiling support
bsps/powerpc: Add support for interrupt profiling
arm: Add support for interrupt profiling
smptests/smpload01: New test
Add documentation for profiling