ipc: fix recursive data queue locking on SMP

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拉取/合并请求描述：(PR description)

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rt_data_queue_pop() holds the data queue spinlock while updating the ring state, then calls rt_data_queue_len(). The length function tries to acquire the same non-recursive spinlock again, causing an SMP deadlock when a pop leaves the queue non-empty.

Add a private _data_queue_len_nolock() helper for callers which already hold the queue lock. Keep the public rt_data_queue_len() protected by one spinlock acquisition.

This does not change the public API, ABI, queue state transitions, low-water mark wakeups, or event callback behavior.

Tested on a four-core Spacemit K1 with cyclic HDMI playback and by building the SMP QEMU Virt64 RISC-V BSP with generic audio, Intel HDA and VirtIO Sound.

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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clang-format 源码格式化工具确保格式符合RT-Thread代码规范 This PR has been formatted with clang-format and complies with RT-Thread code specification
• 如果是新增bsp, 已经添加ci检查到.github/ALL_BSP_COMPILE.json 详细请参考链接BSP自查

[github-actions]

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[github-actions]

MemBrowse Memory Report

gd32105r-start

• CODE: .text -104 B (-0.1%, 69,260 B / 262,144 B, total: 26% used)

hc32f334

• FLASH: .text -104 B (-0.1%, 99,460 B / 131,072 B, total: 76% used)

infineon-psoc6

• flash: .text -104 B (-0.1%, 116,104 B / 262,144 B, total: 44% used)

k230

• SRAM: .eh_frame -56 B, .text -16 B (-0.0%, 1,122,611 B / 268,300,288 B, total: 0% used)

loongson-ls1cdev

• Code: .text -168 B (-0.0%, 362,616 B)

nuvoton-m487

• CODE: .text -132 B (-0.0%, 355,680 B / 524,288 B, total: 68% used)

qemu-virt64-aarch64

• Code: .eh_frame +24 B, .text +64 B (+0.0%, 1,056,540 B)
• Data: .data +8 B (+0.0%, 517,384 B)

raspberry-pico-rp2040

• FLASH: .rodata -24 B, .text -112 B (-0.1%, 114,064 B / 2,097,152 B, total: 5% used)

simulator

• Code: .eh_frame +32 B, .eh_frame_hdr +8 B, .rela.dyn -432 B, .rodata -64 B, .text -83 B (-0.0%, 2,633,574 B)
• Data: .data -512 B (-0.0%, 1,582,724 B)

stm32f407-rt-spark

• CODE: .text -104 B (-0.1%, 85,728 B / 1,048,576 B, total: 8% used)

stm32l475-atk-pandora-llvm

• ROM: .text -124 B (-0.1%, 83,384 B / 524,288 B, total: 16% used)
  No memory changes detected for:
• at32f415-start
• esp32-c3
• hpmicro-hpm5301evklite
• nordic-nrf51822
• nxp-lpc1114
• renesas-ra2l1
• wch-ch32v208w-r0
• x86
• xuantie-e901plus

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@Rbb666 看看需不需要找人 review