components: drivers: add RT_USING_SMP judgement inside smp_call.h

smp_call.h defines SMP-related structures and declares
SMP-related functions. These codes are only valid when
RT_USING_SMP is defined in the bsp, which means we have
to use RT_USING_SMP for judgment in every place where
this file is included, such as following:

```c
```

Now move the judgment of RT_USING_SMP directly into
smp_call.h, so that it's simpler to include the header
file as:

```c
```

Signed-off-by: Chen Wang <unicorn_wang@outlook.com>

components/drivers/smp_call/smp_call.h

@@ -13,6 +13,8 @@
 #define __SMP_IPI_H__
 #include <rtthread.h>
 
+#ifdef RT_USING_SMP
+
 /* callback of smp call */
 typedef void (*rt_smp_call_cb_t)(void *data);
 typedef rt_bool_t (*rt_smp_cond_t)(int cpu, void *info);
@@ -66,4 +68,7 @@ rt_inline size_t rt_smp_get_next_remote(size_t iter, size_t cpuid)
     return iter == cpuid ? iter + 1 : iter;
 }
 #define rt_smp_for_each_remote_cpu(_iter, _cpuid) for (_iter = rt_smp_get_next_remote(-1, _cpuid); (_iter) < RT_CPUS_NR; _iter=rt_smp_get_next_remote(_iter, _cpuid))
-#endif
+
+#endif // RT_USING_SMP
+
+#endif // __SMP_IPI_H__