target/nds32: use lowercase for C variables

Convert to lowercase the name of arrays.
Convert to macro two uppercase const variables.

Change-Id: Ic6f5cad38722dfdf78d662ff4893e94482ab423d
Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>
Reviewed-on: http://openocd.zylin.com/6348
Tested-by: jenkins
Reviewed-by: Marc Schink <dev@zapb.de>
Reviewed-by: Xiang W <wxjstz@126.com>

src/target/nds32_insn.h

@@ -72,7 +72,7 @@
 #define FMTDR(a, b)				(0x6A000049 | ((a) << 20) | ((b) << 15))
 
 /* break instructions */
-extern const int NDS32_BREAK_16;
-extern const int NDS32_BREAK_32;
+#define NDS32_BREAK_16			(0x00EA)
+#define NDS32_BREAK_32			(0x0A000064)
 
 #endif /* OPENOCD_TARGET_NDS32_INSN_H */