ARM: dts: msm: specify UART configuration on msmfalcon.

Initial support for all BLSP UARTs with default configuration
and disabled state such that clients can overwrite and enable
respective UART instance as per need.

Change-Id: I15ef73049cee76c6ea5b3916d9281bbd9fdfc563
Signed-off-by: Mukesh Kumar Savaliya <msavaliy@codeaurora.org>