xilinx: Disable CONFIG_BOOTSTD_DEFAULTS for some xilinx boards

Since CONFIG_BOOTSTD_DEFAULTS now selects ENV_VARS_UBOOT_CONFIG we cannot
enable it for some Xilinx boards which have a very small environment.

Disable it.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/configs/xilinx_versal_mini_emmc0_defconfig b/configs/xilinx_versal_mini_emmc0_defconfig
index 31b3c02..8aadc7f 100644
--- a/configs/xilinx_versal_mini_emmc0_defconfig
+++ b/configs/xilinx_versal_mini_emmc0_defconfig
@@ -16,6 +16,7 @@
 CONFIG_SYS_LOAD_ADDR=0x8000000
 # CONFIG_EXPERT is not set
 CONFIG_REMAKE_ELF=y
+# CONFIG_BOOTSTD_DEFAULTS is not set
 # CONFIG_AUTOBOOT is not set
 CONFIG_USE_BOOTCOMMAND=y
 CONFIG_BOOTCOMMAND="run distro_bootcmd"
diff --git a/configs/xilinx_versal_mini_emmc1_defconfig b/configs/xilinx_versal_mini_emmc1_defconfig
index 5480cf1..5ccc200 100644
--- a/configs/xilinx_versal_mini_emmc1_defconfig
+++ b/configs/xilinx_versal_mini_emmc1_defconfig
@@ -16,6 +16,7 @@
 CONFIG_SYS_LOAD_ADDR=0x8000000
 # CONFIG_EXPERT is not set
 CONFIG_REMAKE_ELF=y
+# CONFIG_BOOTSTD_DEFAULTS is not set
 # CONFIG_AUTOBOOT is not set
 CONFIG_USE_BOOTCOMMAND=y
 CONFIG_BOOTCOMMAND="run distro_bootcmd"
diff --git a/configs/xilinx_zynqmp_mini_emmc0_defconfig b/configs/xilinx_zynqmp_mini_emmc0_defconfig
index 54b22ae..44deaba 100644
--- a/configs/xilinx_zynqmp_mini_emmc0_defconfig
+++ b/configs/xilinx_zynqmp_mini_emmc0_defconfig
@@ -18,6 +18,7 @@
 CONFIG_REMAKE_ELF=y
 # CONFIG_MP is not set
 CONFIG_FIT=y
+# CONFIG_BOOTSTD_DEFAULTS is not set
 CONFIG_SUPPORT_RAW_INITRD=y
 # CONFIG_AUTOBOOT is not set
 # CONFIG_DISPLAY_CPUINFO is not set
diff --git a/configs/xilinx_zynqmp_mini_emmc1_defconfig b/configs/xilinx_zynqmp_mini_emmc1_defconfig
index eb78e0a..b9b003c 100644
--- a/configs/xilinx_zynqmp_mini_emmc1_defconfig
+++ b/configs/xilinx_zynqmp_mini_emmc1_defconfig
@@ -19,6 +19,7 @@
 # CONFIG_MP is not set
 CONFIG_FIT=y
 CONFIG_SUPPORT_RAW_INITRD=y
+# CONFIG_BOOTSTD_DEFAULTS is not set
 # CONFIG_AUTOBOOT is not set
 # CONFIG_DISPLAY_CPUINFO is not set
 CONFIG_BOARD_EARLY_INIT_R=y