ath79: fix pinmux reg value for QCA956x

The range of pinmux reg property "<0x1804002c 0x40>" for QCA956x SoC
does not includes GPIO_FUNCTION register.

If the device uses "&jtag_disable_pins", this causes the following
errors:

[    1.982937] pinctrl-single 1804002c.pinmux: mux offset out of range: 0x40 (0x40)
[    1.990622] pinctrl-single 1804002c.pinmux: could not add functions for pinmux_jtag_disable_pins 64x

Signed-off-by: INAGAKI Hiroshi <musashino.open@gmail.com>

target/linux/ath79/dts/qca956x.dtsi

@@ -71,7 +71,7 @@
 			pinmux: pinmux@1804002c {
 				compatible = "pinctrl-single";
 
-				reg = <0x1804002c 0x40>;
+				reg = <0x1804002c 0x44>;
 
 				#size-cells = <0>;