ppc4xx: alpr: Remove some not needed commands to make image fit again

The latest changes in the u-boot/next branch increased the size of the
alpr image a bit more. Now it doesn't fit into the 256k reserved for it.
This patch now removes the commands "askenv" and "irq" which are not
needed in the production systems.

Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Pieter Voorthuijsen <pieter.voorthuijsen@prodrive.nl>

include/configs/alpr.h

@@ -231,13 +231,11 @@
  */
 #include <config_cmd_default.h>
 
-#define CONFIG_CMD_ASKENV
 #define CONFIG_CMD_DHCP
 #define CONFIG_CMD_DIAG
 #define CONFIG_CMD_EEPROM
 #define CONFIG_CMD_FPGA
 #define CONFIG_CMD_I2C
-#define CONFIG_CMD_IRQ
 #define CONFIG_CMD_MII
 #define CONFIG_CMD_NAND
 #define CONFIG_CMD_NET