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/sbin/pam_namespace_helper

@@ -0,0 +1,15 @@
+#!/bin/sh
+
+CONF=/etc/security/namespace.conf
+
+# Match logic of process_line(), except lines with $HOME are ignored
+# skip the leading white space, rip off the comments, ignore empty lines
+sed -e 's/^[ 	]*//g' -e 's/#.*//g' -e '/.*\$HOME.*/d'  -e '/^$/d' < $CONF | \
+    while read polydir instance_prefix method uids; do
+	if [ ! -e "$instance_prefix" ]; then
+	    echo "mkdir $instance_prefix"
+	    mkdir --parents --mode=0 -Z "$instance_prefix"
+	fi
+    done
+
+exit 0