kmod-md-multipath was removed in kernel 6.12, remove the dependency here
too.
This fixes the build of the gemini target.
Fixes: d12a603de5 ("kernel: kmod-md-multipath: Depend on kernel 6.6")
Link: https://github.com/openwrt/openwrt/pull/19532
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
c2066fcb95