kernel: bump 6.6 to 6.6.55

kernel: bump 6.6 to 6.6.55

Changelog: https://cdn.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.6.55

Added the following default ksym to target/linux/generic/config-6.6:
	CONFIG_PROC_MEM_ALWAYS_FORCE=y
	# CONFIG_PROC_MEM_FORCE_PTRACE is not set
	# CONFIG_PROC_MEM_NO_FORCE is not set

Removed upstreamed:
	generic/backport-6.6/780-23-v6.12-r8169-Fix-spelling-mistake-tx_underun-tx_underrun.patch[1]
	generic/backport-6.6/780-25-v6.12-r8169-add-tally-counter-fields-added-with-RTL8125.patch[2]
	generic/pending-6.6/684-gso-fix-gso-fraglist-segmentation-after-pull-from-fr.patch[3]
	lantiq/patches-6.6/0025-v6.12-net-ethernet-lantiq_etop-fix-memory-disclosure.patch[4]

Manually rebased:
	bcm27xx/patches-6.6/950-0086-Main-bcm2708-bcm2709-linux-port.patch
	bcm27xx/patches-6.6/950-0998-i2c-designware-Add-support-for-bus-clear-feature.patch

All other patches automatically rebased.

1. https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v6.6.56&id=f02fcb7283b1c25f7e3ae07d7a2c830e06eb1a62
2. https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v6.6.56&id=1c723d785adb711496bc64c24240f952f4faaabf
3. https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v6.6.56&id=af3122f5fdc0d00581d6e598a668df6bf54c9daa
4. https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v6.6.56&id=e66e38d07b31e177ca430758ed97fbc79f27d966

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/16655
Signed-off-by: Nick Hainke <vincent@systemli.org>