kernel: bump 6.6 to 6.6.88

kernel: bump 6.6 to 6.6.88

Changelog: https://cdn.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.6.88

Manually rebased:
 - bcm27xx/patches-6.6/950-0327-media-i2c-ov7251-Make-the-enable-GPIO-optional.patch[1]
 - bcm27xx/patches-6.6/950-0521-PCI-brcmstb-Add-BCM2712-support.patch[2]
 - generic/hack-6.6/610-net-page_pool-try-to-free-deferred-skbs-while-waitin.patch[3]
 - generic/pending-6.6/734-net-ethernet-mediatek-enlarge-DMA-reserve-buffer.patch[4]

All other patches automatically rebased.

1. https://web.git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v6.6.88&id=f249c05416ea0bef24c9dbed0e653d2fad87b127
2. https://web.git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v6.6.88&id=1fea7726276e5d6526ecd4e7ccb4c91a6135deb5
3. https://web.git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v6.6.88&id=95f17738b86fd198924d874a5639bcdc49c7e5b8
4. https://web.git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v6.6.88&id=a2874f0dff63829d1f540003e2d83adb610ee64a

Signed-off-by: Mieczyslaw Nalewaj <[email protected]>
Link: https://github.com/openwrt/openwrt/pull/18607
Signed-off-by: Hauke Mehrtens <[email protected]>