esp8266: Avoid including ep_mphal.h directly.

This header has no include guards and is apparently only supposed to be
included from py/mphal.h.

This work was funded through GitHub Sponsors.

Signed-off-by: Angus Gratton <angus@redyak.com.au>

ports/esp8266/esp_init_data.c

@@ -27,7 +27,6 @@
 #include <stdio.h>
 #include "ets_sys.h"
 #include "etshal.h"
-#include "esp_mphal.h"
 #include "user_interface.h"
 #include "extmod/misc.h"
 

ports/esp8266/esp_mphal.c

@@ -28,9 +28,9 @@
 #include "ets_sys.h"
 #include "etshal.h"
 #include "uart.h"
-#include "esp_mphal.h"
 #include "user_interface.h"
 #include "ets_alt_task.h"
+#include "py/mphal.h"
 #include "py/runtime.h"
 #include "py/stream.h"
 #include "extmod/misc.h"

ports/esp8266/uart.c

@@ -17,7 +17,7 @@
 #include "etshal.h"
 #include "c_types.h"
 #include "user_interface.h"
-#include "esp_mphal.h"
+#include "py/mphal.h"
 
 // seems that this is missing in the Espressif SDK
 #define FUNC_U0RXD 0