ARM: dts: msm: Set default state of cts/rx into bias-disable

bias-no-pull is not a valid state which will cause default state
of cts/rx be set to high which will finally lead to failure in
UART communication

Change-Id: I6575f866b33c702c8820b8179df956b0398898b6
Signed-off-by: Yanfei Zhou <zyanfei@codeaurora.org>