main/postmarketos-bootsplash: revert to killing plymouth using an openrc service

Ferass El Hafidirequested to merge
funderscore/plymouth-openrc-workaround into main

plymouth-openrc-plugin (and any other OpenRC plugins really) trigger a bug in OpenRC that only happens on musl-based systems, which can result in a hang if a service fails.

A PR has been submitted to OpenRC to fix this bug. While the PR is waiting for review and merging, work around this by reverting to killing the splash from an OpenRC service to at least no longer trigger this bug. See #4536 (closed) for more context.

PR here if someone wants to test it: https://github.com/OpenRC/openrc/pull/1007

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