delete the config of PM

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@2291 bbd45198-f89e-11dd-88c7-29a3b14d5316

components/drivers/include/rtdevice.h

@@ -86,10 +86,6 @@ rt_size_t rt_ringbuffer_emptry_size(struct rt_ringbuffer* rb);
 
 #endif /* RT_USING_I2C */
 
-#ifdef RT_USING_PM
-#include "drivers/pm.h"
-#endif
-
 #ifdef RT_USING_SDIO
 #include "drivers/mmcsd_core.h"
 #include "drivers/sd.h"