mpc8641: only define CONFIG_ENV_SIZE once

It's currently defined twice inside in an if/else block, but
both halves set the same value.  Move the define outside
the if.
Signed-off-by: NBecky Bruce <becky.bruce@freescale.com>

include/configs/MPC8641HPCN.h

@@ -522,12 +522,11 @@ extern unsigned long get_board_sys_clk(unsigned long dummy);
     #define CONFIG_ENV_IS_IN_FLASH	1
     #define CONFIG_ENV_ADDR		(CONFIG_SYS_MONITOR_BASE + 0x60000)
     #define CONFIG_ENV_SECT_SIZE		0x10000	/* 64K(one sector) for env */
-    #define CONFIG_ENV_SIZE		0x2000
 #else
     #define CONFIG_ENV_IS_NOWHERE	1	/* Store ENV in memory only */
     #define CONFIG_ENV_ADDR		(CONFIG_SYS_MONITOR_BASE - 0x1000)
-    #define CONFIG_ENV_SIZE		0x2000
 #endif
+#define CONFIG_ENV_SIZE		0x2000
 
 #define CONFIG_LOADS_ECHO	1	/* echo on for serial download */
 #define CONFIG_SYS_LOADS_BAUD_CHANGE	1	/* allow baudrate change */