ARM: msm: dts: Add the UART instance for mpq8092 CDP

Add the correct UART instance used in mpq8092 CDP.
Enable the clocks required for this UART instance.

Change-Id: Icf42e672a0720f2b7c6c73124bbe37c0cef11515
Signed-off-by: Srinivas Ramana <sramana@codeaurora.org>