BC3450 board: Remove unused CONFIG_SYS_CPU definition

This fixes:
cmd_bc3450.c:55:0: warning: "CONFIG_SYS_CPU" redefined [enabled by default]

Signed-off-by: Wolfgang Denk <wd@denx.de>
Cc: Detlev Zundel <dzu@denx.de>

board/bc3450/cmd_bc3450.c

@@ -45,7 +45,6 @@
 #define THERM_WRITE_TL		0x02
 #define THERM_WRITE_TH		0x01
 
-#define CONFIG_SYS_CPU			2
 #define CONFIG_SYS_1SHOT		1
 #define CONFIG_SYS_STANDALONE		0