[NUCLEO_F334R8] RTOS main of some test enhanced

RTOS_3(semaphore) main of test enhanced for IAR and GCC
RTOS_2(mutex) main of test enhanced for IAR

Author: dbestm

libraries/tests/rtos/mbed/mutex/main.cpp

@@ -12,6 +12,8 @@
  */
 #if defined(TARGET_STM32L053R8) || defined(TARGET_STM32L053C8)
     #define STACK_SIZE DEFAULT_STACK_SIZE/4
+#elif defined(TARGET_STM32F334R8) && defined(TOOLCHAIN_IAR)
+    #define STACK_SIZE DEFAULT_STACK_SIZE/4	
 #else
     #define STACK_SIZE DEFAULT_STACK_SIZE
 #endif

libraries/tests/rtos/mbed/semaphore/main.cpp

@@ -13,6 +13,8 @@
  */
 #if defined(TARGET_STM32L053R8) || defined(TARGET_STM32L053C8)
     #define STACK_SIZE DEFAULT_STACK_SIZE/4
+#elif defined(TARGET_STM32F334R8) && (defined(TOOLCHAIN_GCC) || defined(TOOLCHAIN_IAR))
+    #define STACK_SIZE DEFAULT_STACK_SIZE/4
 #else
     #define STACK_SIZE DEFAULT_STACK_SIZE
 #endif