pinctrl: imx7d-pinctrl: Fix a typo

Fix a typo in "Peripherals".
Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

Documentation/devicetree/bindings/pinctrl/fsl,imx7d-pinctrl.txt

@@ -19,7 +19,7 @@ iomuxc: iomuxc@30330000 {
 	reg = <0x30330000 0x10000>;
 };
 
-Pheriparials using pads from iomuxc-lpsr support low state retention power
+Peripherals using pads from iomuxc-lpsr support low state retention power
 state, under LPSR mode GPIO's state of pads are retain.
 
 Please refer to fsl,imx-pinctrl.txt in this directory for common binding part