Convert CONFIG_ENV_IS_IN_FLASH to Kconfig
This converts the following to Kconfig:
CONFIG_ENV_IS_IN_FLASH
Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/configs/vexpress_ca9x4_defconfig b/configs/vexpress_ca9x4_defconfig
index 7b845c6..851f034 100644
--- a/configs/vexpress_ca9x4_defconfig
+++ b/configs/vexpress_ca9x4_defconfig
@@ -1,6 +1,7 @@
CONFIG_ARM=y
CONFIG_TARGET_VEXPRESS_CA9X4=y
CONFIG_DISTRO_DEFAULTS=y
+CONFIG_ENV_IS_IN_FLASH=y
# CONFIG_DISPLAY_CPUINFO is not set
# CONFIG_DISPLAY_BOARDINFO is not set
# CONFIG_CMD_CONSOLE is not set