arm64: zynqmp: Do not use any EXTRA_ENV_SETTINGS

No reason to save additional variables to environment for mini
configurations.
Signed-off-by: NMichal Simek <michal.simek@xilinx.com>

include/configs/xilinx_zynqmp_mini.h

@@ -12,6 +12,8 @@
 
 #define CONFIG_SYS_MEMTEST_SCRATCH     0xfffc0000
 
+#define CONFIG_EXTRA_ENV_SETTINGS
+
 #include <configs/xilinx_zynqmp.h>
 
 /* Undef unneeded configs */