imx8mq_pins: fix configuration for UART4 on ECSPI2 pads
When routing UART4 using the ECSPI2 pads, register IOMUXC_UART4_RXD_SELECT_INPUT (offset 0x050C) should be changed only when dealing with RX, as its name suggests. Signed-off-by:Arnaud Ferraris <arnaud.ferraris@collabora.com> Reviewed-by:
Fabio Estevam <festevam@denx.de>
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