ARM: shmobile: alt dts: Replace status value "ok" by "okay"

While the DT parsing code recognizes "ok" as a valid value for the
"status" property, ePAPR v1.1 doesn't mention it in the list of valid
values.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm/boot/dts/r8a7794-alt.dts

@@ -40,9 +40,9 @@ &extal_clk {
 };
 
 &cmt0 {
-	status = "ok";
+	status = "okay";
 };
 
 &scif2 {
-	status = "ok";
+	status = "okay";
 };