arm64: zynqmp: Disable BOOTCOMMAND

There is no need to waste a space for setting up bootcommand which is
passed via xilinx_zynqmp.h by including "config_distro_bootcmd.h"
header.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
diff --git a/include/configs/xilinx_zynqmp_mini.h b/include/configs/xilinx_zynqmp_mini.h
index 00ca3d4..9e49641 100644
--- a/include/configs/xilinx_zynqmp_mini.h
+++ b/include/configs/xilinx_zynqmp_mini.h
@@ -15,6 +15,7 @@
 #include <configs/xilinx_zynqmp.h>
 
 /* Undef unneeded configs */
+#undef CONFIG_BOOTCOMMAND
 #undef CONFIG_EXTRA_ENV_SETTINGS
 #undef CONFIG_SYS_MALLOC_LEN
 #undef CONFIG_ZLIB