MLK-12763 ARM: imx7d: iomux: correct uart input sel option value

MLK-12763 ARM: imx7d: iomux: correct uart input sel option value

GPIO0~GPIO7 part:
- Commit(c8cabda5ab07) add some wrong input sel value for uart, return
  them to origin setting.
- Add uart DTE pin mode setting.

UART2_TX_DATA pin part:
- RM doc "iMX7D_RM_Rev0_Approval.pdf" (2016.04.25 updated in compass)
  updated input sel define for UART2_RX_DATA, then set the correct input
  sel for the pin.

Signed-off-by: Fugang Duan <fugang.duan@nxp.com>
(cherry picked from commit: 90a8b06b9735dd5b8d2023ff3b95886441e0e8d9)