kernel: bump 5.10 to 5.10.85

Removed target for patch which does not exist:
    bcm27xx/patches-5.10/950-0249-kbuild-Disable-gcc-plugins.patch

All patches automatically rebased.

Build system: x86_64
Build-tested: bcm2711/RPi4B, ipq806x/R7800*
Run-tested: bcm2711/RPi4B, ipq806x/R7800*

* Had to revert 7f1edbd41295dff9f2127b169fbc086c0fb2c14e in order to build
  (binutils 2.37, https://bugs.openwrt.org/index.php?do=details&task_id=4149)

Signed-off-by: John Audia <graysky@archlinux.us>