ARM: davinci: da850: adopt to pinctrl-single change for configuring multiple pins

function-mask DT property is now a mask for a pin at each pin offset
inside a given pincontrol register. Fix DA850 DT data to reflect
this change.
Signed-off-by: Manjunathappa, Prakash <prakash.pm@ti.com>
[nsekhar@ti.com: reword commit message for clarity]
Signed-off-by: Sekhar Nori <nsekhar@ti.com>

arch/arm/boot/dts/da850.dtsi

@@ -37,7 +37,7 @@ pmx_core: pinmux@1c14120 {
 			#size-cells = <0>;
 			pinctrl-single,bit-per-mux;
 			pinctrl-single,register-width = <32>;
-			pinctrl-single,function-mask = <0xffffffff>;
+			pinctrl-single,function-mask = <0xf>;
 			status = "disabled";
 
 			nand_cs3_pins: pinmux_nand_pins {