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 <[email protected]>

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