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/64-btrfs-zoned.rules

@@ -0,0 +1,9 @@
+SUBSYSTEM!="block", GOTO="btrfs_end"
+ACTION!="add|change", GOTO="btrfs_end"
+ENV{ID_FS_TYPE}!="btrfs", GOTO="btrfs_end"
+
+# Zoned btrfs needs an IO scheduler that supports zone write locking and
+# currently mq-deadline is the only scheduler capable of this.
+ATTR{queue/zoned}=="host-managed", ATTR{queue/scheduler}="mq-deadline"
+
+LABEL="btrfs_end"