Revert "t480/t480s - add patches/coreboot-25.09/0006-mb-lenovo-t480-Fix-headphone-jack.patch"

This reverts commit 61b5cf5.

Repro to resync coreboot repo + reapply patches:
echo "bogus" | sudo tee build/x86/coreboot-25.09/.canary
./docker_repro.sh make BOARD=EOL_t480s-maximized

patches/coreboot-25.09/0006-mb-lenovo-t480-Fix-headphone-jack.patch was not tested against t480 and this is t480s PR.
For those interested into bringing the patch back to t480 and test it, see commit details of 61b5cf5.

Signed-off-by: Thierry Laurion <insurgo@riseup.net>

Author: tlaurion