[EFR32] Reduce test stack sizes on EFR32

Author: stevew817

TESTS/mbedmicro-rtos-mbed/mutex/main.cpp

@@ -32,6 +32,8 @@
     #define STACK_SIZE 768
 #elif (defined(TARGET_EFM32GG_STK3700)) && !defined(TOOLCHAIN_ARM_MICRO)
     #define STACK_SIZE 1536
+#elif (defined(TARGET_EFR32)) && !defined(TOOLCHAIN_ARM_MICRO)
+    #define STACK_SIZE 768
 #elif defined(TARGET_MCU_NRF51822) || defined(TARGET_MCU_NRF52832)
     #define STACK_SIZE 1024
 #elif defined(TARGET_XDOT_L151CC)

TESTS/mbedmicro-rtos-mbed/semaphore/main.cpp

@@ -35,6 +35,8 @@
     #define STACK_SIZE 768
 #elif (defined(TARGET_EFM32GG_STK3700)) && !defined(TOOLCHAIN_ARM_MICRO)
     #define STACK_SIZE 1536
+#elif (defined(TARGET_EFR32)) && !defined(TOOLCHAIN_ARM_MICRO)
+    #define STACK_SIZE 768
 #elif defined(TARGET_MCU_NRF51822) || defined(TARGET_MCU_NRF52832)
     #define STACK_SIZE 768
 #elif defined(TARGET_XDOT_L151CC)

TESTS/mbedmicro-rtos-mbed/threads/main.cpp

@@ -27,6 +27,8 @@
     #define STACK_SIZE 1024
 #elif defined(TARGET_HI2110)
     #define STACK_SIZE 512
+#elif defined(TARGET_EFR32)
+    #define STACK_SIZE 512
 #else
     #define STACK_SIZE DEFAULT_STACK_SIZE
 #endif