arm: mvebu: fix wrongly named DS414 pinctrl entries

While renaming pinctrl entries during reviews of Synology DS414 support
series, I missed three entries, as reported by Ben. This patch fixes
those.
Reported-by: Ben Peddell <klightspeed@killerwolves.net>
Signed-off-by: Arnaud Ebalard <arno@natisbad.org>
Link: https://lkml.kernel.org/r/608e4fd6e06e9c5289a84b9c38e81b2456dbcd79.1416670812.git.arno@natisbad.orgSigned-off-by: Jason Cooper <jason@lakedaemon.net>

arch/arm/boot/dts/armada-xp-synology-ds414.dts

@@ -308,17 +308,17 @@ syno_id_bit0_pin: syno-id-bit0-pin {
 		marvell,function = "gpio";
 	};
 
-	pmx_syno_id_bit1: syno-id-bit1-pin {
+	syno_id_bit1_pin: syno-id-bit1-pin {
 		marvell,pins = "mpp28";
 		marvell,function = "gpio";
 	};
 
-	pmx_syno_id_bit2: syno-id-bit2-pin {
+	syno_id_bit2_pin: syno-id-bit2-pin {
 		marvell,pins = "mpp29";
 		marvell,function = "gpio";
 	};
 
-	pmx_fan1_alarm: fan1-alarm-pin {
+	fan1_alarm_pin: fan1-alarm-pin {
 		marvell,pins = "mpp33";
 		marvell,function = "gpio";
 	};