arm: zynq: Enable distro defaults setting

BOOTCOMMAND is composed with distro_bootcmd but this variable is not
present. Enabling distro defaults setting is fixing it.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
diff --git a/configs/topic_miamiplus_defconfig b/configs/topic_miamiplus_defconfig
index 223dc2e..7dd07c7 100644
--- a/configs/topic_miamiplus_defconfig
+++ b/configs/topic_miamiplus_defconfig
@@ -7,13 +7,12 @@
 CONFIG_BOOT_INIT_FILE="board/topic/zynq/zynq-topic-miamiplus/ps7_regs.txt"
 CONFIG_DEFAULT_DEVICE_TREE="zynq-topic-miamiplus"
 CONFIG_DEBUG_UART=y
+CONFIG_DISTRO_DEFAULTS=y
 CONFIG_BOOTDELAY=0
-CONFIG_USE_BOOTCOMMAND=y
 CONFIG_BOOTCOMMAND="run $modeboot || run distro_bootcmd"
 # CONFIG_DISPLAY_CPUINFO is not set
 CONFIG_SPL=y
 CONFIG_SPL_STACK_R=y
-CONFIG_HUSH_PARSER=y
 CONFIG_SYS_PROMPT="zynq-uboot> "
 CONFIG_CMD_THOR_DOWNLOAD=y
 CONFIG_CMD_DFU=y
@@ -25,9 +24,6 @@
 CONFIG_CMD_USB=y
 # CONFIG_CMD_SETEXPR is not set
 CONFIG_CMD_CACHE=y
-CONFIG_CMD_EXT4=y
-CONFIG_CMD_FAT=y
-CONFIG_CMD_FS_GENERIC=y
 CONFIG_OF_EMBED=y
 CONFIG_SPL_DM_SEQ_ALIAS=y
 CONFIG_DFU_RAM=y