support stm8

1. see: TencentOS-tiny\board\STM8L052R8T6\IAR\hello_world
2. compile/debug/run with IAR for STM8

arch/msp430/common/include/tos_cpu_def.h

@@ -1,17 +1,13 @@
 #ifndef _TOS_CPU_DEF_H_
 #define  _TOS_CPU_DEF_H_
 
-enum CPU_WORD_SIZE {
-    CPU_WORD_SIZE_08,
-    CPU_WORD_SIZE_16,
-    CPU_WORD_SIZE_32,
-    CPU_WORD_SIZE_64,
-};
+#define CPU_WORD_SIZE_08            1
+#define CPU_WORD_SIZE_16            2
+#define CPU_WORD_SIZE_32            3
+#define CPU_WORD_SIZE_64            4
 
-enum CPU_STK_GROWTH {
-    CPU_STK_GROWTH_ASCENDING,
-    CPU_STK_GROWTH_DESCENDING,
-};
+#define CPU_STK_GROWTH_ASCENDING    1
+#define CPU_STK_GROWTH_DESCENDING   2
 
 #endif /* _TOS_CPU_DEF_H_ */