generic: 6.18: remove obsolete pending patches

generic: 6.18: remove obsolete pending patches

Remove obsolete pending patches already included in kernel 6.18.
 - 620-net-sfp-improve-Huawei-MA5671a-fixup.patch[1]
 - 704-net-phy-register-phy-led_triggers-during-probe-to-av.patch[2]

[1] https://web.git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=linux-6.18.y&id=ecb4ed7a723f02c81a0111a13ceeabb26f50f899
[2] https://web.git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=linux-6.18.y&id=2764dcb3c35de4410f642afc62cf979727470575

Signed-off-by: Mieczyslaw Nalewaj <namiltd@yahoo.com>
Link: https://github.com/openwrt/openwrt/pull/21078
Signed-off-by: Robert Marko <robimarko@gmail.com>