refactor: 对LiteOS_a内核中menuconfig开关的宏使用#ifdef/#ifndef做预编译处理

LiteOS_a中有部分配置宏进行了重复冗余定义，导致当头文件未被包含时，极易引入错误，
故对menuconfig配置宏进行统一处理，均使用#ifdef/#ifndef作为预编译判断方式

Close #I3YEGS
Signed-off-by: Nboxi <lewis.liulei@huawei.com>
Change-Id: I59dc4fb0b7bf8da1b6aafd2f0b2a568ad601d3ec

fs/jffs2/background.c

@@ -53,7 +53,7 @@ void jffs2_start_garbage_collect_thread(struct jffs2_sb_info *c)
 	stGcTask.auwArgs[0] = (UINTPTR)c;
 	stGcTask.uwStackSize  = LOSCFG_BASE_CORE_TSK_DEFAULT_STACK_SIZE;
 	stGcTask.pcName = "jffs2_gc_thread";
-#if (LOSCFG_KERNEL_SMP == YES)
+#ifdef LOSCFG_KERNEL_SMP
 	unsigned int i;
 	for (i = 0; i < CONFIG_MTD_PATTITION_NUM; i++) {
 		if (sb->s_dev == &jffs2_dev_list[i])