Add tests for asynchronous serial

Author: svastm

libraries/tests/utest/serial_asynch/serial_asynch.cpp

@@ -51,6 +51,10 @@
 #define TEST_SERIAL_ONE_TX_PIN PB_10   // UART3
 #define TEST_SERIAL_TWO_RX_PIN PA_10   // UART1
 
+#elif defined(TARGET_NUCLEO_F207ZG)
+#define TEST_SERIAL_ONE_TX_PIN PC_12   // UART5
+#define TEST_SERIAL_TWO_RX_PIN PC_11   // UART4
+
 #elif defined(TARGET_DISCO_F334C8)
 #define TEST_SERIAL_ONE_TX_PIN PB_10   // UART3
 #define TEST_SERIAL_TWO_RX_PIN PA_10   // UART1