ARM: dts: imx6q-tbs2910: fix pcie reset polarity

According to Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt the
polarity of "reset-gpio" is assumed to be active-low unless a separate
property "reset-gpio-active-high" is available. So replace the inconsistent
polarity description to make the correct active-low reset behavior more
obvious.
Signed-off-by: Soeren Moch <smoch@web.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx6q-tbs2910.dts

@@ -191,7 +191,7 @@ rtc: ds1307@68 {
 &pcie {
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_pcie>;
-	reset-gpio = <&gpio7 12 GPIO_ACTIVE_HIGH>;
+	reset-gpio = <&gpio7 12 GPIO_ACTIVE_LOW>;
 	status = "okay";
 };