[Components] Remove vbus component and realview-a8-vmm libcpu

[Copilot]

Removes legacy vbus component and associated code. Vbus was an early implementation for RTOS-Linux communication that has been superseded by RPMsg in modern deployments.

Components Removed

• components/vbus/ - Complete vbus component (1,318 LOC core implementation)
• libcpu/arm/realview-a8-vmm/ - ARM VMM libcpu support
• components/Kconfig - Removed vbus rsource reference

BSP Cleanups

bsp/nxp/lpc/lpc43xx/M0/ and M4/

• Removed vbus driver and configuration files (vbus_drv.c, vbus_hw.h, vbus_conf.h, vbus_local_conf.h)
• Removed RT_USING_VBUS macro definitions from rtconfig.h
• Simplified application.c LED thread to toggle locally instead of via vbus communication:

// Before: LED controlled by vbus messages from M4
len = rt_device_read(vbus_dev, 0, &led_value, sizeof(led_value));
led_dev->write(led_dev, 1, &led_value, sizeof(led_value));

// After: LED toggles independently
led_value = !led_value;
led_dev->write(led_dev, 0, &led_value, sizeof(led_value));
rt_thread_delay(1000);

bsp/airm2m/air105/

• Removed unused rt_vbus_do_init() declaration from board.h

Notes

USB-related "vbus" references (USB VBUS power line detection/control) remain unchanged - they are unrelated to this component.

Total: 43 files changed, 4,537 deletions, 5 insertions

Original prompt

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This section details on the original issue you should resolve

<issue_title>[Feature] 移除vbus部分代码及相关的代码</issue_title>
<issue_description>### Describe problem solved by the proposed feature

因为vbus是很早之前实现的代码了，现在在 RTOS + Linux的场合更多使用RPMsg方式，所以移除这部分实现，包括：

• components/vbus
• components下的Kconfig的引用；
• libcpu/arm/realview-a8-vmm 之前使用了vbus的libcpu；

也需要在代码中完整的搜索下，是否有vbus，vmm等相关的代码，如果有相关代码，对这部分代码进行深入分析，以确定是否移除。

Describe your preferred solution

No response

Describe possible alternatives

No response</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes [Feature] 移除vbus部分代码及相关的代码 #10862

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[github-actions]

📌 Code Review Assignment

🏷️ Tag: components

Reviewers: @Maihuanyi

Changed Files (Click to expand)

• components/Kconfig
• components/vbus/Kconfig
• components/vbus/SConscript
• components/vbus/prio_queue.c
• components/vbus/prio_queue.h
• components/vbus/share_hdr/vbus_api.h
• components/vbus/vbus.c
• components/vbus/vbus.h
• components/vbus/vbus_chnx.c
• components/vbus/watermark_queue.c
• components/vbus/watermark_queue.h

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📊 Current Review Status (Last Updated: 2025-10-29 08:11 CST)

• ⌛ @Maihuanyi Pending Review

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