systemd: install "core platform" overrides into /usr

I really want to support the use case of an empty /etc by default, so it
makes a lot of sense to move our overrides (which are, however, platform
defaults for us) into /usr.

Change-Id: I9ce0e3bbffbec4572e72be5a2a64755272077a7d
diff --git a/board/czechlight/common/overlay/etc/systemd/journald.conf b/board/czechlight/common/overlay/usr/lib/systemd/journald.conf
similarity index 100%
rename from board/czechlight/common/overlay/etc/systemd/journald.conf
rename to board/czechlight/common/overlay/usr/lib/systemd/journald.conf
diff --git a/board/czechlight/common/overlay/etc/systemd/network/30-usbnet-apipa.network b/board/czechlight/common/overlay/usr/lib/systemd/network/30-usbnet-apipa.network
similarity index 100%
rename from board/czechlight/common/overlay/etc/systemd/network/30-usbnet-apipa.network
rename to board/czechlight/common/overlay/usr/lib/systemd/network/30-usbnet-apipa.network
diff --git a/board/czechlight/common/overlay/etc/systemd/system/czechlight-roadm-v2.service b/board/czechlight/common/overlay/usr/lib/systemd/system/czechlight-roadm-v2.service
similarity index 100%
rename from board/czechlight/common/overlay/etc/systemd/system/czechlight-roadm-v2.service
rename to board/czechlight/common/overlay/usr/lib/systemd/system/czechlight-roadm-v2.service
diff --git a/board/czechlight/common/overlay/etc/systemd/system/netopeer2-server.service b/board/czechlight/common/overlay/usr/lib/systemd/system/netopeer2-server.service
similarity index 100%
rename from board/czechlight/common/overlay/etc/systemd/system/netopeer2-server.service
rename to board/czechlight/common/overlay/usr/lib/systemd/system/netopeer2-server.service
diff --git a/board/czechlight/common/overlay/etc/systemd/system/sysrepod.service b/board/czechlight/common/overlay/usr/lib/systemd/system/sysrepod.service
similarity index 100%
rename from board/czechlight/common/overlay/etc/systemd/system/sysrepod.service
rename to board/czechlight/common/overlay/usr/lib/systemd/system/sysrepod.service