ARM: dts: msm: Add UART related entries for SDM855

Add pincontrol, and device settings to support console & high-speed
UART on SDM855 platform.

CRs-Fixed: 2124301
Change-Id: Idd532cb7c7b32bfff3a99ce816940d498ee2862b
Signed-off-by: Sagar Dharia <sdharia@codeaurora.org>
Signed-off-by: Karthikeyan Ramasubramanian <kramasub@codeaurora.org>