[STM32L0] Add tests for asynchronous serial

Author: svastm

libraries/tests/utest/serial_asynch/serial_asynch.cpp

@@ -47,6 +47,14 @@
 #define TEST_SERIAL_ONE_TX_PIN D1   // UART2
 #define TEST_SERIAL_TWO_RX_PIN D4   // UART5
 
+#elif defined(TARGET_NUCLEO_L053R8)
+#define TEST_SERIAL_ONE_TX_PIN PB_10   // UART3
+#define TEST_SERIAL_TWO_RX_PIN PA_10   // UART1
+
+#elif defined(TARGET_NUCLEO_L073RZ)
+#define TEST_SERIAL_ONE_TX_PIN PB_10   // UART3
+#define TEST_SERIAL_TWO_RX_PIN PA_10   // UART1
+
 #elif defined(TARGET_NUCLEO_L152RE)
 #define TEST_SERIAL_ONE_TX_PIN PB_10   // UART3
 #define TEST_SERIAL_TWO_RX_PIN PA_10   // UART1