[NUCLEO_F446RE] resolving rebase error and missing test

- resolving a rebase conflict
- adding pin config for MBED_A7 test (interruptin)

Author: ohagendorf

libraries/tests/mbed/interruptin/main.cpp

@@ -45,6 +45,7 @@ void in_handler() {
       defined(TARGET_NUCLEO_F334R8) || \
       defined(TARGET_NUCLEO_F401RE) || \
       defined(TARGET_NUCLEO_F411RE) || \
+      defined(TARGET_NUCLEO_F446RE) || \
       defined(TARGET_NUCLEO_L053R8) || \
       defined(TARGET_NUCLEO_L073RZ) || \
       defined(TARGET_NUCLEO_L152RE)