ARM: dts: msm: Rectify GPIO functionality for SDM670 console usecase

Correct the GPIO function assigned for QUP12 GPIOs on SDM670.

Change-Id: I8ca3c88afe9943c1e06f227602a04007789c7980
Signed-off-by: Mukesh Kumar Savaliya <msavaliy@codeaurora.org>