arm: mvebu: crs305-1g-4s: Enable CMD_BOOTZ and increase SYS_BOOTM_LEN

This change enables CMD_BOOTZ and increases SYS_BOOTM_LEN to
make it easier to work with kernel images.

Signed-off-by: Luka Kovacic <me@lukakovacic.xyz>
Reviewed-by: Stefan Roese <sr@denx.de>
Signed-off-by: Stefan Roese <sr@denx.de>
diff --git a/configs/crs305-1g-4s_defconfig b/configs/crs305-1g-4s_defconfig
index 26e1c91..df77cb8 100644
--- a/configs/crs305-1g-4s_defconfig
+++ b/configs/crs305-1g-4s_defconfig
@@ -7,6 +7,7 @@
 CONFIG_SYS_CONSOLE_INFO_QUIET=y
 CONFIG_CMD_MEMTEST=y
 CONFIG_SYS_ALT_MEMTEST=y
+CONFIG_CMD_BOOTZ=y
 # CONFIG_CMD_FLASH is not set
 CONFIG_CMD_I2C=y
 CONFIG_CMD_SF=y