ppc4xx: Remove unused features from PMC440 board support

This patch shrinks the PMC440 u-boot binary (from next branch)
to fit into 384kB again.

Signed-off-by: Matthias Fuchs <matthias.fuchs@esd.eu>
Signed-off-by: Stefan Roese <sr@denx.de>

include/configs/PMC440.h

@@ -351,7 +351,6 @@
 
 #define CONFIG_CMD_BSP
 #define CONFIG_CMD_DATE
-#define CONFIG_CMD_ASKENV
 #define CONFIG_CMD_DHCP
 #define CONFIG_CMD_DTT
 #define CONFIG_CMD_DIAG
@@ -359,7 +358,6 @@
 #define CONFIG_CMD_ELF
 #define CONFIG_CMD_FAT
 #define CONFIG_CMD_I2C
-#define CONFIG_CMD_IRQ
 #define CONFIG_CMD_MII
 #define CONFIG_CMD_NAND
 #define CONFIG_CMD_NET