We do not need two debug.h files.
Take Fujitsu's STATIC_ASSERT over BUILD_BUG_ON because it is more used
Change-Id: If04c17fbb7406ab15fe86267fed8d6da460cec62
Fujitsu: POSTK_DEBUG_ARCH_DEP_9
these functions are more logical to keep together there as they depend
on each other.
Also add a comment about the __printf attribute, if we have a quiet
period it would be useful to enable and clear the thousands of
warnings...
Change-Id: I47d3891c9cd87da28b2883c29384959f5abd1459