kernel: bump 6.12 to 6.12.58

kernel: bump 6.12 to 6.12.58

changelogs:
https://cdn.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.12.58

Removed upstreamed patches:
1. target/linux/generic/backport-6.12/612-01-v6.17-net-dsa-tag_brcm-legacy-reorganize-functions.patch
   Upstream: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v6.12.58&id=a4daaf063f8269a5881154c5b77c5ef6639d65d3

2. target/linux/qualcommax/patches-6.12/0151-arm64-qcom-ipq6018-nss_port5.patch
   Upstream: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v6.12.58&id=9a7a5d50ee2e035325de9c720e4842d6759d2374

3. target/linux/realtek/patches-6.12/020-01-v6.18-timer-rtl-otto-work-around-dying-timers.patch
   Upstream: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v6.12.58&id=d0e217b33d42bfe52ef7ef447916a23a586e6e5c

4. target/linux/realtek/patches-6.12/020-03-v6.18-timer-rtl-otto-do-not-interfere-with-interrupts.patch
   Upstream: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v6.12.58&id=8cc561dd9d02f1753ae34dfdd565662828be9a9d

Additional changes:
- Manually adapted bcm27xx patch:
  * 950-0410-media-i2c-adv7180-Add-support-for-V4L2_CID_LINK_FREQ.patch
    Rebased and adjusted for kernel 6.12 to fix context conflicts.
- Synced lantiq DTS (danube.dtsi) with upstream bindings
  to fix DT validation issues on kernel 6.12.
- Manually adapted DTS to match OpenWrt's lantiq DTS layout.

Compile-tested on x86_64
Run-tested on x86_64

Signed-off-by: gongzi miao <[email protected]>
Link: https://github.com/openwrt/openwrt/pull/20777
Signed-off-by: Hauke Mehrtens <[email protected]>