【老师提案】QEMU 模拟器 ignore_memory_transaction_failures 废弃

### 项目标题

QEMU 模拟器 ignore_memory_transaction_failures 废弃

### 项目描述

QEMU 模拟器 MachineClass::ignore_memory_transaction_failures 只应被 legacy 机器设置，详见：

include/hw/boards.h

```
 * @ignore_memory_transaction_failures:
 *    If this is flag is true then the CPU will ignore memory transaction
 *    failures which should cause the CPU to take an exception due to an
 *    access to an unassigned physical address; the transaction will instead
 *    return zero (for a read) or be ignored (for a write). This should be
 *    set only by legacy board models which rely on the old RAZ/WI behaviour
 *    for handling devices that QEMU does not yet model. New board models
 *    should instead use "unimplemented-device" for all memory ranges where
 *    the guest will attempt to probe for a device that QEMU doesn't
 *    implement and a stub device is required.
```

本项目计划：

- 删掉所有机器代码中设置 ignore_memory_transaction_failures 为 true 的代码，并为这些机器添加 "unimplemented-device"
- 删掉 MachineClass::ignore_memory_transaction_failures

### 项目难度

中等

### 项目社区导师

`Bin Meng <bmeng@tinylab.org>`

### 项目产出要求

- 撰写项目开发/测试文档，提交 PR
- upstream 改动到上游社区
- 在线分享 “QEMU 模拟器 ignore_memory_transaction_failures 废弃”

### 项目技术要求

- Linux / Windows 基本操作
- 对 QEMU 模拟器有一定了解

### 相关的开源软件仓库列表

- QEMU: https://gitee.com/mirrors/qemu

泰晓科技/RISCV-Linux

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