Add SPI pins for test code

Author: ccli8

features/unsupported/tests/rtos/mbed/file/main.cpp

@@ -39,6 +39,9 @@ void sd_thread(void const *argument)
 #elif defined(TARGET_NUMAKER_PFM_M453)
     SDFileSystem sd(PD_13, PD_14, PD_15, PD_12, "sd");
 
+#elif defined(TARGET_NUMAKER_PFM_M487)
+    SDFileSystem sd(D11, D12, D13, D10, "sd");
+    
 #else
     SDFileSystem sd(p11, p12, p13, p14, "sd");
 #endif