score: Work area initialization API change

The work areas (RTEMS work space and C program heap) will be initialized
now in a separate step and are no longer part of
rtems_initialize_data_structures().  Initialization is performed with
tables of Heap_Area entries.  This allows usage of scattered memory
areas present on various small scale micro-controllers.

The sbrk() support API changes also.  The bsp_sbrk_init() must now deal
with a minimum size for the first memory chunk to take the configured
work space size into account.

c/src/lib/libbsp/sparc/leon3/include/bsp.h

@@ -114,8 +114,8 @@ void bsp_spurious_initialize( void );
 
 /* Allocate 8-byte aligned non-freeable pre-malloc() memory. The function
  * can be called at any time. The work-area will shrink when called before
- * bsp_get_work_area(). malloc() is called to get memory when this function
- * is called after bsp_get_work_area().
+ * bsp_work_area_initialize(). malloc() is called to get memory when this function
+ * is called after bsp_work_area_initialize().
  */
 void *bsp_early_malloc(int size);