ARM: dts: dm816x: Correct the state of the write protect pin

Commit 599c376c ("ARM: dts: Fix gpio interrupts for dm816x")
corrected some problems with the MMC.  However, it gets the write
protect pin backwards.  It needs to be ACTIVE_HIGH not ACTIVE_LOW.

Cc: Rob Herring <robh+dt@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Tony Lindgren <tony@atomide.com>
Signed-off-by: Mihail Grigorov <michael.grigorov@konsulko.com>
Signed-off-by: Tom Rini <trini@konsulko.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/boot/dts/dm8168-evm.dts

@@ -196,7 +196,7 @@ &mmc1 {
 	vmmc-supply = <&vmmcsd_fixed>;
 	bus-width = <4>;
 	cd-gpios = <&gpio2 7 GPIO_ACTIVE_LOW>;
-	wp-gpios = <&gpio2 8 GPIO_ACTIVE_LOW>;
+	wp-gpios = <&gpio2 8 GPIO_ACTIVE_HIGH>;
 };
 
 /* At least dm8168-evm rev c won't support multipoint, later may */