kernel: bump 6.12 to 6.12.34

kernel: bump 6.12 to 6.12.34

Changelog: https://cdn.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.12.34

Remove upstreamed patches:
  generic/backport-6.12/421-01-v6.16-spi-bcm63xx-spi-fix-shared-reset.patch [1]
  generic/backport-6.12/421-02-v6.16-spi-bcm63xx-hsspi-fix-shared-reset.patch [2]
  generic/backport-6.12/610-06-v6.16-net-dsa-b53-do-not-enable-RGMII-delay-on-bcm63xx.patch [3]
  generic/backport-6.12/610-08-v6.16-net-dsa-b53-allow-RGMII-for-bcm63xx-RGMII-ports.patch [4]
  generic/backport-6.12/610-09-v6.16-net-dsa-b53-do-not-touch-DLL_IQQD-on-bcm53115.patch [5]
  generic/backport-6.12/611-v6.16-net-dsa-tag_brcm-legacy-fix-pskb_may_pull-length.patch [6]

Manually rebased patches:
  bcm27xx/patches-6.12/950-0665-drm-vc4-tests-Drop-drm-parameter-for-vc4_find_crtc_f.patch [7]

[1] https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v6.12.34&id=408ca1d1803b223d615f9021055f9ccb4f4863ea
[2] https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v6.12.34&id=2a98786e258718ff93ef6d6bd26a9a39076e0cb7
[3] https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v6.12.34&id=6d1c93a5c6b0ae87bb7001d8d6fdef3b3be9c6c6
[4] https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v6.12.34&id=1aa31695bf0dc1ee3e6c559c14db7fd05b6bb102
[5] https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v6.12.34&id=b2fc08d276797e529cacad6fa9d704a7367090b5
[6] https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v6.12.34&id=2c32fc56c05aa69439fdfd5e0b25f57e2a158627
[7] https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v6.12.34&id=aba86d49e5ac3700295ab8c417436abacc19cc32

Signed-off-by: Shiji Yang <yangshiji66@outlook.com>
Link: https://github.com/openwrt/openwrt/pull/19184
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>