systemd: move sysusers.d systemd-remote to PN-journal-remote

systemd: move sysusers.d systemd-remote to PN-journal-remote

systemd's sysusers.d/systemd-remote.conf contains the user
"systemd-journal-remote" [1]. This file is currently not part of any
specific package.

To make this match the corresponding USERADD_PARAM:${PN}-journal-remote
for the same user, move the file to the correct package.

This prevents warnings in case PACKAGECONFIG contains "microhttpd" but
systemd-journal-remote is not installed, such as:

  WARNING: some-image-1.0-r0 do_rootfs: User systemd-journal-remote has never been defined

[1] https://github.com/systemd/systemd/blob/v257.3/sysusers.d/systemd-remote.conf

Signed-off-by: Bastian Krause <bst@pengutronix.de>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>