ARM: dts: msm: Remove unwanted compatible string for QUPV3 UART

Currently dtsi is having two separate compatible strings which is not
really needed. Instead keep the unique but different compatibility for
2-wire console UART and 4-wire HSUART drivers.

Change-Id: Ib1c5aade099bf8ace157dcbf4223cc8b0acb8050
Signed-off-by: Mukesh Kumar Savaliya <msavaliy@codeaurora.org>