ARM: dts: msm: fix HS UART node overwrite issue

If 2 DT labels reference the same address node,
then enabling the first DT label in some platform
will result in the second reference enabled.
This was discovered for UART.
Make appropriate change to fix this problem.

Change-Id: Id4a9362fe831da3bba5972f06979d31899279b89
Signed-off-by: yangbiao Ma <yma@codeaurora.org>