microblaze: Enable HUSH via Kconfig

Cleanup board file.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
diff --git a/configs/microblaze-generic_defconfig b/configs/microblaze-generic_defconfig
index f30e9c1..39c2ad2 100644
--- a/configs/microblaze-generic_defconfig
+++ b/configs/microblaze-generic_defconfig
@@ -7,6 +7,7 @@
 CONFIG_SPL=y
 CONFIG_FIT=y
 CONFIG_FIT_VERBOSE=y
+CONFIG_HUSH_PARSER=y
 CONFIG_SYS_PROMPT="U-Boot-mONStR> "
 CONFIG_CMD_GPIO=y
 # CONFIG_CMD_SETEXPR is not set