global change: repace sched_xfree() to kxmm_free()

Changes:
sched_xfree() => kxmm_free()
remove garbage related APIs
remove ARCH_HAVE_GARBAGE

Cause garbage feature move to mm_heap, then don't need
garbage anymore.

Change-Id: If310790a3208155ca8ab319e8d038cb6ff92c518
Signed-off-by: ligd <liguiding@fishsemi.com>

sched/timer/timer_release.c

@@ -71,7 +71,7 @@ static inline void timer_free(struct posix_timer_s *timer)
       /* Otherwise, return it to the heap */
 
       leave_critical_section(flags);
-      sched_kfree(timer);
+      kmm_free(timer);
     }
 }