Revert "EventQueue: Add required header file and namespace element instead add all"

This reverts commit 7446ebb.
Going to 5.11

Author: adbridge

events/EventQueue.cpp

@@ -14,11 +14,10 @@
  * limitations under the License.
  */
 #include "events/EventQueue.h"
-#include "events/mbed_events.h"
 
-using mbed::Callback;
+#include "events/mbed_events.h"
+#include "mbed.h"
 
-namespace events {
 
 EventQueue::EventQueue(unsigned event_size, unsigned char *event_pointer)
 {
@@ -78,4 +77,3 @@ void EventQueue::chain(EventQueue *target)
         equeue_chain(&_equeue, 0);
     }
 }
-}

events/equeue/equeue_mbed.cpp

@@ -21,16 +21,7 @@
 #if defined(EQUEUE_PLATFORM_MBED)
 
 #include <stdbool.h>
-#include <string.h>
-#include "platform/mbed_critical.h"
-#include "drivers/Timer.h"
-#include "drivers/Ticker.h"
-#include "drivers/Timeout.h"
-#include "drivers/LowPowerTimeout.h"
-#include "drivers/LowPowerTicker.h"
-#include "drivers/LowPowerTimer.h"
-
-using namespace mbed;
+#include "mbed.h"
 
 // Ticker operations
 #if MBED_CONF_RTOS_PRESENT
@@ -42,7 +33,6 @@ unsigned equeue_tick() {
 #else
 
 #if MBED_CONF_EVENTS_USE_LOWPOWER_TIMER_TICKER
-
 #define ALIAS_TIMER      LowPowerTimer
 #define ALIAS_TICKER     LowPowerTicker
 #define ALIAS_TIMEOUT    LowPowerTimeout

events/mbed_shared_queues.cpp

@@ -15,11 +15,7 @@
  */
 
 #include "events/mbed_shared_queues.h"
-
-#ifdef MBED_CONF_RTOS_PRESENT
-#include "rtos/Thread.h"
-using rtos::Thread;
-#endif
+#include "mbed.h"
 
 using namespace events;