Add some bsp driver for HC32F4A8.

[JamieTx]

拉取/合并请求描述：(PR description)

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Add some bsp driver for HC32F4A8.
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当前拉取/合并请求的状态 Intent for your PR

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• 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

[Copilot]

Pull Request Overview

This PR adds support and driver updates for the HC32F4A8 MCU variant, extending existing HAL layers and board configurations.

• Enable HC32F4A8 in RTC, PM, MCAN, ETH, and DAC drivers
• Introduce VBAT power-down check for RTC initialization
• Update board-specific ports, Kconfig entries, and application code for F4A8

Reviewed Changes

Copilot reviewed 24 out of 24 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
bsp/hc32/libraries/hc32_drivers/drv_rtc.c	Add F4A8 support and VBAT power-down check
bsp/hc32/libraries/hc32_drivers/drv_pm.h	Extend EFM readiness check to F4A8
bsp/hc32/libraries/hc32_drivers/drv_pm.c	Include F4A8 in deep-sleep and run-mode transitions
bsp/hc32/libraries/hc32_drivers/drv_mcan.c	Update MCAN ISR to accept int_sel parameter
bsp/hc32/libraries/hc32_drivers/drv_eth.c	Adapt PHY address handling and auto-negotiation config for F4A8
bsp/hc32/libraries/hc32_drivers/drv_dac.h	Extend DAC init struct with new F4A8 channel parameters
bsp/hc32/libraries/hc32_drivers/drv_dac.c	Implement channel init logic for F4A8 DAC ports
bsp/hc32/ev_hc32f4a8_lqfp176/board/{ports,config,board_config.c,hc32f4xx_conf.h,Kconfig}	Add board-level port mappings, DAC/Kconfig updates, and FCM application changes for F4A8

Comments suppressed due to low confidence (2)

bsp/hc32/libraries/hc32_drivers/drv_rtc.c:202

• [nitpick] The function VBAT_PowerDownCheck uses PascalCase and no underscore prefix, which is inconsistent with other static helper functions; consider renaming to _vbat_power_down_check to match existing naming conventions.

static en_flag_status_t VBAT_PowerDownCheck(void)

bsp/hc32/libraries/hc32_drivers/drv_mcan.c:862

• The mcan_isr definition was changed to accept two parameters, but any forward declarations or other references expecting a single-parameter signature will break; ensure the prototype is updated everywhere (including headers) to match this new signature.

rt_inline void mcan_isr(hc32_mcan_driver_t *driver, uint32_t int_sel)