kernel: bump 6.6 to 6.6.103

kernel: bump 6.6 to 6.6.103

Changelog: https://cdn.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.6.103

removed upstream patches:
generic-backport/220-v6.16-powerpc-boot-fix-build-with-gcc-15.patch [1]
generic-backport/847-v6.17-Revert-leds-trigger-netdev-Configure-LED-blink-inter.patch [2]

update patch to upstream function change
bcm53x/patches-6.6/180-usb-xhci-add-support-for-performing-fake-doorbell.patch
changed function xhci_disable_and_free_slot() upstream [3]

All other patches auto-refreshed.

[1] https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v6.6.103&id=93879b3ba967a33834727abf34ea08764339fe0b
[2] https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v6.6.103&id=c66caf21b1d0a0847adc34d368e3f6753a2cbd53
[3] https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/drivers/usb/host?h=v6.6.103&id=e600de541c37f97482fea2a7a26f186141e7ddea

Suggested-by: Leo Barsky <leobrsky@proton.me>
Signed-off-by: Goetz Goerisch <ggoerisch@gmail.com>
Link: https://github.com/openwrt/openwrt/pull/19898
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>