Set configMAX_SYSCALL_INTERRUPT_PRIORITY to 4 for QEMU demos (#986)

* Update FreeRTOSConfig.h

* Update FreeRTOSConfig.h

* Update FreeRTOSConfig.h

FreeRTOS/Demo/CORTEX_LM3S6965_GCC_QEMU/FreeRTOSConfig.h

@@ -93,7 +93,7 @@ FreeRTOS/Source/tasks.c for limitations. */
 #define configKERNEL_INTERRUPT_PRIORITY 		( 255 )	/* All eight bits as QEMU doesn't model the priority bits. */
 /* !!!! configMAX_SYSCALL_INTERRUPT_PRIORITY must not be set to zero !!!!
 See http://www.FreeRTOS.org/RTOS-Cortex-M3-M4.html. */
-#define configMAX_SYSCALL_INTERRUPT_PRIORITY 	( 5 )
+#define configMAX_SYSCALL_INTERRUPT_PRIORITY 	( 4 )
 
 /* Use the Cortex-M3 optimised task selection rather than the generic C code
 version. */

FreeRTOS/Demo/CORTEX_M3_MPS2_QEMU_GCC/FreeRTOSConfig.h

@@ -121,7 +121,7 @@ unsigned long ulGetRunTimeCounterValue( void ); /* Prototype of function that re
 
 /* !!!! configMAX_SYSCALL_INTERRUPT_PRIORITY must not be set to zero !!!!
  * See http://www.FreeRTOS.org/RTOS-Cortex-M3-M4.html. */
-#define configMAX_SYSCALL_INTERRUPT_PRIORITY    191 /* equivalent to 0xa0, or priority 5. */
+#define configMAX_SYSCALL_INTERRUPT_PRIORITY    4
 #define configMAC_INTERRUPT_PRIORITY            5
 
 /* Prototype for the function used to print out.  In this case it prints to the

FreeRTOS/Demo/CORTEX_MPU_M3_MPS2_QEMU_GCC/FreeRTOSConfig.h

@@ -106,7 +106,7 @@ unsigned long ulGetRunTimeCounterValue( void ); /* Prototype of function that re
 
 /* !!!! configMAX_SYSCALL_INTERRUPT_PRIORITY must not be set to zero !!!!
  * See http://www.FreeRTOS.org/RTOS-Cortex-M3-M4.html. */
-#define configMAX_SYSCALL_INTERRUPT_PRIORITY           191 /* equivalent to 0xa0, or priority 5. */
+#define configMAX_SYSCALL_INTERRUPT_PRIORITY           4
 #define configMAC_INTERRUPT_PRIORITY                   5
 
 #define configENFORCE_SYSTEM_CALLS_FROM_KERNEL_ONLY    ( 1 )