arm64: dts: imx8mm-phyboard-polis: Set debug uart muxing to 0x140

Set Pull Resistors Enable bit to put signal into a defined state.
Signed-off-by: Yannic Moog <y.moog@phytec.de>
Signed-off-by: Cem Tenruh <c.tenruh@phytec.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm64/boot/dts/freescale/imx8mm-phyboard-polis-rdk.dts

@@ -424,8 +424,8 @@ MX8MM_IOMUXC_SAI3_TXFS_UART2_DTE_TX	0x00
 
 	pinctrl_uart3: uart3grp {
 		fsl,pins = <
-			MX8MM_IOMUXC_UART3_RXD_UART3_DCE_RX	0x40
-			MX8MM_IOMUXC_UART3_TXD_UART3_DCE_TX	0x40
+			MX8MM_IOMUXC_UART3_RXD_UART3_DCE_RX	0x140
+			MX8MM_IOMUXC_UART3_TXD_UART3_DCE_TX	0x140
 		>;
 	};