Remove some spaces and blank lines
Implement SIZEALLOCATED_MM() in mm_macros.h
Add function malloc to interface mm_it

The memory manager interface is extended with the function
malloc.

The default and test implementations are extended also.
Implement memory manager MM_TEST macros

Use ALLOC_MM_TEST instead of ALLOC_MM to generate an error in case of
KONFIG_UNITTEST is defined.
Use RESIZE_MM_TEST instead of RESIZE_MM to generate an error in case of
KONFIG_UNITTEST is defined.
Use FREE_MM_TEST instead of FREE_MM to generate an error in case of
KONFIG_UNITTEST is defined.