env: Rename DEFAULT_ENV_FILE to ENV_DEFAULT_ENV_TEXT_FILE

Rename the variable and add ENV_ prefix, so that all configuration
options which are related to environment would have an CONFIG_ENV_
prefix. No functional change.

Also rename USE_DEFAULT_ENV_FILE to USE_ENV_DEFAULT_ENV_TEXT_FILE .

Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
diff --git a/include/env_default.h b/include/env_default.h
index 6e8f2ea..9caf22c 100644
--- a/include/env_default.h
+++ b/include/env_default.h
@@ -27,7 +27,7 @@
 #else
 const char default_environment[] = {
 #endif
-#ifndef CONFIG_USE_DEFAULT_ENV_FILE
+#ifndef CONFIG_ENV_USE_DEFAULT_ENV_TEXT_FILE
 #ifdef	CONFIG_ENV_CALLBACK_LIST_DEFAULT
 	ENV_CALLBACK_VAR "=" CONFIG_ENV_CALLBACK_LIST_DEFAULT "\0"
 #endif
@@ -136,7 +136,7 @@
 	"\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
 #endif
 	"\0"
-#else /* CONFIG_USE_DEFAULT_ENV_FILE */
+#else /* CONFIG_ENV_USE_DEFAULT_ENV_TEXT_FILE */
 #include "generated/defaultenv_autogenerated.h"
 #endif
 #ifdef DEFAULT_ENV_INSTANCE_EMBEDDED