serial: Add support for Qualcomm serial port

[u-boot] / doc / device-tree-bindings / serial / msm-serial.txt

diff --git a/doc/device-tree-bindings/serial/msm-serial.txt b/doc/device-tree-bindings/serial/msm-serial.txt
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+Qualcomm UART (Data Mover mode)
+
+Required properties:
+- compatible: must be "qcom,msm-uartdm-v1.4"
+- reg: start address and size of the registers
+- clock: interface clock (must accept baudrate as a frequency)