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/etc/udhcpc/udhcpc.conf

@@ -0,0 +1,11 @@
+# Do not overwrite /etc/resolv.conf
+#RESOLV_CONF="no"
+
+# Use alternative path for resolv.conf
+#RESOLV_CONF="/tmp/resolv.conf"
+
+# Prevent overwriting of resolv.conf on a per-interface basis
+#NO_DNS="eth1 wlan1"
+
+# List of interfaces where DHCP routes are ignored
+#NO_GATEWAY="eth1 wlan1"