kernel: bump 6.6 to 6.6.51

kernel: bump 6.6 to 6.6.51

Changelog: https://cdn.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.6.51

Removed upstreamed:
	generic/backport-6.6/200-regmap-maple-work-around-false-positive-warning.patch
	generic/backport-6.6/822-v6.11-0012-nvmem-Fix-return-type-of-devm_nvmem_device_get-in-ke.patch
	bcm27xx/patches-6.6/950-1018-drivers-mmc-apply-SD-quirks-earlier-during-probe.patch

Manually rebased:
	bcm27xx/patches-6.6/950-0993-drivers-mmc-cqhci-clear-CQHCI_CTL-if-halt-fails.patch
	ramips/patches-6.6/311-MIPS-use-set_mode-to-enable-disable-the-cevt-r4k-irq.patch[4]

All other patches automatically rebased.

1. https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v6.6.51&id=e42ea96d6d36a16526cb82b8aa2e5422814c3250
2. https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v6.6.51&id=3d1baf322a3a69b38b6b2d511cfe0d611d1b5462
3. https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v6.6.51&id=115a755bb38db5a1175be44e6a9a93a0a8233885
4. Adapted the changes from Hauke Mehrtens' modification in PR#16366 to 5.15.167

Build system: x86/64
Build-tested: x86/64/AMD Cezanne, flogic/xiaomi_redmi-router-ax6000-ubootmod, ramips/tplink_archer-a6-v3
Run-tested: x86/64/AMD Cezanne, 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/16370
Signed-off-by: Robert Marko <robimarko@gmail.com>