[STM32L1] Add tests for asynchronous serial

Author: svastm

libraries/tests/utest/serial_asynch/serial_asynch.cpp

@@ -47,6 +47,10 @@
 #define TEST_SERIAL_ONE_TX_PIN D1   // UART2
 #define TEST_SERIAL_TWO_RX_PIN D4   // UART5
 
+#elif defined(TARGET_NUCLEO_L152RE)
+#define TEST_SERIAL_ONE_TX_PIN PB_10   // UART3
+#define TEST_SERIAL_TWO_RX_PIN PA_10   // UART1
+
 #elif defined(TARGET_DISCO_F334C8)
 #define TEST_SERIAL_ONE_TX_PIN PB_10   // UART3
 #define TEST_SERIAL_TWO_RX_PIN PA_10   // UART1
@@ -94,6 +98,7 @@
 #elif defined(TARGET_NUCLEO_L476RG)
 #define TEST_SERIAL_ONE_TX_PIN PB_10   // UART3
 #define TEST_SERIAL_TWO_RX_PIN PA_10   // UART1
+
 #elif defined(TARGET_RZ_A1H)
 #define TEST_SERIAL_ONE_TX_PIN P8_14  // UART4
 #define TEST_SERIAL_TWO_RX_PIN P8_11  // UART5