Kconfig/init: change help text to match default value

Change the "If unsure" message to match the default value.

Signed-off-by: John Kacur <jkacur at gmail dot com>
Signed-off-by: NSam Ravnborg <sam@ravnborg.org>

init/Kconfig

@@ -522,7 +522,7 @@ config CC_OPTIMIZE_FOR_SIZE
 	  Enabling this option will pass "-Os" instead of "-O2" to gcc
 	  resulting in a smaller kernel.
 
-	  If unsure, say N.
+	  If unsure, say Y.
 
 config SYSCTL
 	bool