fix: 删除C文件中无用的__cplusplus

新增的c-sky等模块一些c文件中的依旧保留了无用的__cplusplus需要删除;修复注释中的部分不规范内容修改，缩进，空行，错别字等。

close #I4D0YK

Signed-off-by: kenneth <zhushangyuan@huawei.com>

kernel/arch/xtensa/lx6/gcc/los_arch_atomic.h

@@ -79,7 +79,8 @@ STATIC INLINE INT32 HalAtomicXchg32bits(volatile INT32 *v, INT32 val)
  * @attention
  * <ul>
  * <li>The pointer v must not be NULL.</li>
- * <li>The value which v point to must not be INT_MIN to avoid overflow after reducing 1.</li></ul>
+ * <li>The value which v point to must not be INT_MIN to avoid overflow after reducing 1.</li>
+ * </ul>
  *
  * @param  v      [IN] The addSelf variable pointer.
  *

kernel/arch/xtensa/lx6/gcc/los_interrupt.c

@@ -59,7 +59,7 @@ typedef struct {
 
 /* *
  * @ingroup los_hwi
- * hardware interrupt handler form mapping handling function array.
+ * Hardware interrupt handler form mapping handling function array.
  */
 STATIC HWI_HANDLER_FUNC g_hwiHandlerForm[OS_VECTOR_CNT] = {{ (HWI_PROC_FUNC)0, (HWI_ARG_T)0 }};
 
@@ -79,7 +79,7 @@ VOID OsSetVector(UINT32 num, HWI_PROC_FUNC vector, VOID *arg)
 #else
 /* *
  * @ingroup los_hwi
- * Hardware interrupt handler form mapping handling function array.
+ * hardware interrupt handler form mapping handling function array.
  */
 STATIC HWI_PROC_FUNC g_hwiHandlerForm[OS_VECTOR_CNT] = {0};