lwip-interface: fix issue #2993

DEVICE_ are passed as command line -D, thus no inclusion is required.
``platform.h`` is C++ header file, should not be pulled in C files

Author: 0xc0170

features/FEATURE_LWIP/lwip-interface/emac_lwip.c

@@ -14,8 +14,6 @@
  * limitations under the License.
  */
 
-#include "platform.h"
-
 #if DEVICE_EMAC
 
 #include "emac_api.h"

features/FEATURE_LWIP/lwip-interface/emac_stack_lwip.cpp

@@ -14,8 +14,6 @@
  * limitations under the License.
  */
 
-#include "platform.h"
-
 #if DEVICE_EMAC
 
 #include "emac_stack_mem.h"

features/netsocket/emac_stack_mem.h

@@ -16,8 +16,6 @@
 #ifndef MBED_EMAC_STACK_MEM_H
 #define MBED_EMAC_STACK_MEM_H
 
-#include "platform.h"
-
 #if DEVICE_EMAC
 
 #include <stdint.h>

hal/hal/emac_api.h

@@ -17,9 +17,6 @@
 #ifndef MBED_EMAC_API_H
 #define MBED_EMAC_API_H
 
-#include "platform.h"
-
-
 #if DEVICE_EMAC
 
 #include <stdbool.h>