riscv: dts: ultrarisc: Add serial aliases for dp1000 boards

[WangJia-UR]

Add serial aliases (serial0-serial3) for UART devices (uart0-uart3)
in dp1000-evb-v1, dp1000-m0-v1, and dp1000-titan-v1 board DTS files.

Summary by Sourcery

Enhancements:

• Define serial0–serial3 aliases for existing uart0–uart3 nodes in the dp1000-evb-v1, dp1000-m0-v1, and dp1000-titan-v1 DTS files to standardize serial port naming.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Adds standard serial aliases (serial0-serial3) for existing UART nodes (uart0-uart3) in all dp1000 Ultrarisc board DTS files to improve uniform serial port naming and compatibility.

File-Level Changes

Change	Details	Files
Define serial0-serial3 aliases mapped to uart0-uart3 on all dp1000 Ultrarisc board device trees.	Add or extend the root-level aliases node to include serial0-serial3 properties Map each serial alias (serial0-serial3) to the corresponding UART node (uart0-uart3) label Ensure consistent alias naming across dp1000-evb-v1, dp1000-m0-v1, and dp1000-titan-v1 DTS files	arch/riscv/boot/dts/ultrarisc/dp1000-evb-v1.dts arch/riscv/boot/dts/ultrarisc/dp1000-m0-v1.dts arch/riscv/boot/dts/ultrarisc/dp1000-titan-v1.dts

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[deepin-ci-robot]

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[deepin-ci-robot]

Hi @WangJia-UR. Thanks for your PR.

I'm waiting for a deepin-community member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[sourcery-ai]

Hey - I've left some high level feedback:

• Ensure the new serial0–serial3 aliases are added under the existing /aliases node in each DTS and keep the alias list sorted consistently with the surrounding properties to match existing tree style.
• Double-check that the serialN -> uartN mapping matches whatever port is currently used for stdout-path/console on these boards, so the new aliases don’t unintentionally change which port users expect to be serial0.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- Ensure the new serial0–serial3 aliases are added under the existing /aliases node in each DTS and keep the alias list sorted consistently with the surrounding properties to match existing tree style.
- Double-check that the serialN -> uartN mapping matches whatever port is currently used for stdout-path/console on these boards, so the new aliases don’t unintentionally change which port users expect to be serial0.

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