README: Correct reference for CONFIG_SUPPORT_RAW_INITRD

Signed-off-by: Tom Rini <trini@ti.com>
diff --git a/README b/README
index 3d81092..3012dcd 100644
--- a/README
+++ b/README
@@ -5063,7 +5063,7 @@
 using the "bootz" command. The syntax of "bootz" command is the same
 as the syntax of "bootm" command.
 
-Note, defining the CONFIG_SUPPORT_INITRD_RAW allows user to supply
+Note, defining the CONFIG_SUPPORT_RAW_INITRD allows user to supply
 kernel with raw initrd images. The syntax is slightly different, the
 address of the initrd must be augmented by it's size, in the following
 format: "<initrd addres>:<initrd size>".