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/tools/envcrc.c b/tools/envcrc.c
index 0905180..7f680fb 100644
--- a/tools/envcrc.c
+++ b/tools/envcrc.c
@@ -40,7 +40,7 @@
 # endif
 #endif	/* CONFIG_ENV_IS_IN_FLASH */
 
-#ifdef CONFIG_SYS_REDUNDAND_ENVIRONMENT
+#ifdef CONFIG_ENV_REDUNDANT
 # define ENV_HEADER_SIZE	(sizeof(uint32_t) + 1)
 #else
 # define ENV_HEADER_SIZE	(sizeof(uint32_t))