Add a sanity check for the GPIO pinmap

TESTS/mbed_hal/pinmap/main.cpp

@@ -20,6 +20,7 @@
 
 using namespace utest::v1;
 
+#include "gpio_api.h"
 #include "analogin_api.h"
 #include "analogout_api.h"
 #include "can_api.h"
@@ -38,6 +39,7 @@ typedef struct {
 } pinmap_info_t;
 
 const pinmap_info_t pinmap_functions[] = {
+    PINMAP_TEST_ENTRY(gpio_pinmap),
 #if DEVICE_ANALOGIN
     PINMAP_TEST_ENTRY(analogin_pinmap),
 #endif