kernel: Integrate object cores into kernel

Integrates object cores into the following kernel structures
   sys_mem_blocks, k_mem_slab
   _cpu, z_kernel
   k_thread, k_timer
   k_condvar, k_event, k_mutex, k_sem
   k_mbox, k_msgq, k_pipe, k_fifo, k_lifo, k_stack

Signed-off-by: Peter Mitsis <peter.mitsis@intel.com>