ARM: 9451/1: mm: l2x0: use string choices helper

We can use string choices helper, let's use it.

It updates format

-	..."%sabled", ...? "en" : "dis",
+	..."%s",      ...  str_enabled_disabled(...)
	      ^^^^^

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>