feat(riscv64): add support for restartable system calls

[eatvector]

拉取/合并请求描述：(PR description)

参考aarch64 架构下的系统调用重启实现riscv64架构下的系统调用重启
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为什么提交这份PR (why to submit this PR)

你的解决方案是什么 (what is your solution)

在 RISC-V64 架构中，当支持重启的系统调用被信号中断后，内核会在信号处理完成后，在执行 arch_signal_quit 时，恢复用户态保存的异常帧（exception frame），还原寄存器状态。随后，内核将执行流重定向至陷阱处理入口 trap_entry，让系统调用以与首次执行一致的方式重启。

请提供验证的bsp和config (provide the config and bsp)

• BSP:

• .config:

• action:

]

当前拉取/合并请求的状态 Intent for your PR

必须选择一项 Choose one (Mandatory):

• 本拉取/合并请求是一个草稿版本 This PR is for a code-review and is intended to get feedback
• 本拉取/合并请求是一个成熟版本 This PR is mature, and ready to be integrated into the repo

代码质量 Code Quality：

我在这个拉取/合并请求中已经考虑了 As part of this pull request, I've considered the following:

• 已经仔细查看过代码改动的对比 Already check the difference between PR and old code
• 代码风格正确，包括缩进空格，命名及其他风格 Style guide is adhered to, including spacing, naming and other styles
• 没有垃圾代码，代码尽量精简，不包含#if 0代码，不包含已经被注释了的代码 All redundant code is removed and cleaned up
• 所有变更均有原因及合理的，并且不会影响到其他软件组件代码或BSP All modifications are justified and not affect other components or BSP
• 对难懂代码均提供对应的注释 I've commented appropriately where code is tricky
• 代码是高质量的 Code in this PR is of high quality
• 已经使用formatting 等源码格式化工具确保格式符合RT-Thread代码规范 This PR complies with RT-Thread code specification
• 如果是新增bsp, 已经添加ci检查到.github/workflows/bsp_buildings.yml 详细请参考链接BSP自查

[github-actions]

📌 Code Review Assignment

🏷️ Tag: components

Reviewers: Maihuanyi

Changed Files (Click to expand)

• components/lwp/arch/risc-v/rv64/lwp_arch.c
• components/lwp/arch/risc-v/rv64/lwp_gcc.S

🏷️ Tag: components_lwp

Reviewers: xu18838022837

Changed Files (Click to expand)

• components/lwp/arch/risc-v/rv64/lwp_arch.c
• components/lwp/arch/risc-v/rv64/lwp_gcc.S

🏷️ Tag: libcpu_riscv

Reviewers: Yaochenger

Changed Files (Click to expand)

• libcpu/risc-v/common64/syscall_c.c

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📊 Current Review Status (Last Updated: 2025-07-17 10:38 CST)

• ⌛ Maihuanyi Pending Review
• ⌛ Yaochenger Pending Review
• ⌛ xu18838022837 Pending Review

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