env: Rename SYS_REDUNDAND_ENVIRONMENT to ENV_REDUNDANT

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.

Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
diff --git a/env/fat.c b/env/fat.c
index 1ad301e..65ee1c8 100644
--- a/env/fat.c
+++ b/env/fat.c
@@ -86,7 +86,7 @@
 		return 1;
 	}
 
-#ifdef CONFIG_SYS_REDUNDAND_ENVIRONMENT
+#ifdef CONFIG_ENV_REDUNDANT
 	if (gd->env_valid == ENV_VALID)
 		file = CONFIG_ENV_FAT_FILE_REDUND;
 #endif
@@ -101,7 +101,7 @@
 		return 1;
 	}
 
-#ifdef CONFIG_SYS_REDUNDAND_ENVIRONMENT
+#ifdef CONFIG_ENV_REDUNDANT
 	gd->env_valid = (gd->env_valid == ENV_REDUND) ? ENV_VALID : ENV_REDUND;
 #endif
 
@@ -112,7 +112,7 @@
 static int env_fat_load(void)
 {
 	ALLOC_CACHE_ALIGN_BUFFER(char, buf1, CONFIG_ENV_SIZE);
-#ifdef CONFIG_SYS_REDUNDAND_ENVIRONMENT
+#ifdef CONFIG_ENV_REDUNDANT
 	ALLOC_CACHE_ALIGN_BUFFER(char, buf2, CONFIG_ENV_SIZE);
 	int err2;
 #endif
@@ -153,7 +153,7 @@
 	}
 
 	err1 = file_fat_read(CONFIG_ENV_FAT_FILE, buf1, CONFIG_ENV_SIZE);
-#ifdef CONFIG_SYS_REDUNDAND_ENVIRONMENT
+#ifdef CONFIG_ENV_REDUNDANT
 	err2 = file_fat_read(CONFIG_ENV_FAT_FILE_REDUND, buf2, CONFIG_ENV_SIZE);
 
 	err1 = (err1 >= 0) ? 0 : -1;