ARM: dts: Remove PIN_INPUT for dm816x McSPI

On dm816x we have no PIN_INPUT vs PIN_OUTPUT configuration, there
are just pulls. Let's remove the bogus flags.

Cc: Brian Hutchinson <b.hutchman@gmail.com>
Cc: Matthijs van Duin <matthijsvanduin@gmail.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

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

@@ -29,10 +29,10 @@ vmmcsd_fixed: fixedregulator@0 {
 &dm816x_pinmux {
 	mcspi1_pins: pinmux_mcspi1_pins {
 		pinctrl-single,pins = <
-			DM816X_IOPAD(0x0a94, PIN_INPUT | MUX_MODE0)	/* SPI_SCLK */
-			DM816X_IOPAD(0x0a98, PIN_OUTPUT | MUX_MODE0)	/* SPI_SCS0 */
-			DM816X_IOPAD(0x0aa8, PIN_INPUT | MUX_MODE0)	/* SPI_D0 */
-			DM816X_IOPAD(0x0aac, PIN_INPUT | MUX_MODE0)	/* SPI_D1 */
+			DM816X_IOPAD(0x0a94, MUX_MODE0)			/* SPI_SCLK */
+			DM816X_IOPAD(0x0a98, MUX_MODE0)			/* SPI_SCS0 */
+			DM816X_IOPAD(0x0aa8, MUX_MODE0)			/* SPI_D0 */
+			DM816X_IOPAD(0x0aac, MUX_MODE0)			/* SPI_D1 */
 		>;
 	};