global: Migrate CONFIG_EXTRA_ENV_SETTINGS to CFG

Perform a simple rename of CONFIG_EXTRA_ENV_SETTINGS to CFG_EXTRA_ENV_SETTINGS

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/doc/README.link-local b/doc/README.link-local
index 148b498..ec2ef94 100644
--- a/doc/README.link-local
+++ b/doc/README.link-local
@@ -51,7 +51,7 @@
 and CONFIG_BOOTP_MAY_FAIL.
 If both fail or are disabled, static settings are used.
 
-#define CONFIG_EXTRA_ENV_SETTINGS \
+#define CFG_EXTRA_ENV_SETTINGS \
 	"ipconfigcmd=if test \\\"$dhcpenabled\\\" -ne 0;"		\
 		"then "							\
 			"dhcpfail=0;dhcp || dhcpfail=1;"		\