fix: Switch to space-separated sources.conf format

- Change from colon to space separation to avoid URL parsing issues
- Update sources.conf format: TYPE NAME URL VERSION BUILD_FUNCTION [EXTRA]
- Implement awk-based parsing for reliable field extraction
- Fix firmware package list (remove unavailable linux-firmware-marvell)

initramfs/usr/lib/udev/rules.d/81-net-dhcp.rules

@@ -0,0 +1,14 @@
+# do not edit this file, it will be overwritten on update
+
+ACTION=="remove", GOTO="net_dhcp_end"
+SUBSYSTEM!="net", GOTO="net_dhcp_end"
+
+# Network interfaces requiring DHCPOFFER messages to be broadcast
+# must set ID_NET_DHCP_BROADCAST to "1". This property will be
+# checked by the networkd DHCP4 client to set the DHCP option
+
+# s390 ccwgroup interfaces in layer3 mode need broadcast DHCPOFFER
+# using the link driver to detect this condition
+ENV{ID_NET_DRIVER}=="qeth_l3", ENV{ID_NET_DHCP_BROADCAST}="1"
+
+LABEL="net_dhcp_end"