feature: L0支持厂商自定义malloc相关接口

    可通过在//kernel/liteos_m下make menuconfig配置

close: #I5YBPE
Signed-off-by: Narvinzzz <zhaotianyu9@huawei.com>
Change-Id: I7533cc9148a4211f18186795935c1978f78e6548

porting/liteos_m_iccarm/kernel/src/malloc.c

@@ -33,6 +33,7 @@
 #include "los_config.h"
 #include "los_memory.h"
 
+#ifdef LOSCFG_LIBC_ICCARM_MALLOC
 void *calloc(size_t nitems, size_t size)
 {
     size_t real_size;
@@ -105,3 +106,4 @@ void *realloc(void *ptr, size_t size)
 
     return LOS_MemRealloc(OS_SYS_MEM_ADDR, ptr, size);
 }
+#endif