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/r2dplus_defconfig b/configs/r2dplus_defconfig
index ba68b50..32a1272 100644
--- a/configs/r2dplus_defconfig
+++ b/configs/r2dplus_defconfig
@@ -1,5 +1,6 @@
 CONFIG_SH=y
 CONFIG_TARGET_R2DPLUS=y
+CONFIG_ENV_IS_IN_FLASH=y
 CONFIG_BOOTDELAY=-1
 CONFIG_CMD_IDE=y
 # CONFIG_CMD_SETEXPR is not set