kernel: bump 6.6 to 6.6.80

kernel: bump 6.6 to 6.6.80

Changelog: https://cdn.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.6.80

Removed upstreamed:
	generic/backport-6.6/819-v6.8-0002-nvmem-Create-a-header-for-internal-sharing.patch[1]
	generic/backport-6.6/819-v6.8-0003-nvmem-Simplify-the-add_cells-hook.patch[2]
	generic/backport-6.6/819-v6.8-0004-nvmem-Move-and-rename-fixup_cell_info.patch[3]

All other patches automatically rebased.

1. https://web.git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v6.6.80&id=39dfc17a38f77b14f7cb2619bd3488a18d797d5d
2. https://web.git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v6.6.80&id=276dae17ad9757c3813d9e736a0210f05ccdf8b7
3. https://web.git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v6.6.80&id=a0ee898a5024f12572e4ce45202df9b149dadc05

Build system: x86/64
Build-tested: bcm27xx/bcm2712, flogic/xiaomi_redmi-router-ax6000-ubootmod, ramips/tplink_archer-a6-v3
Run-tested: bcm27xx/bcm2712, flogic/xiaomi_redmi-router-ax6000-ubootmod, ramips/tplink_archer-a6-v3

Signed-off-by: John Audia <therealgraysky@proton.me>
Link: https://github.com/openwrt/openwrt/pull/18140
Signed-off-by: Robert Marko <robimarko@gmail.com>