Fix double /dev/ prefix bug in collect_partitions

lsblk -p returns PKNAME as a full path (/dev/sda), so stripping
the basename before prepending /dev/ avoids /dev//dev/sda.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

system_setup/install.sh

@@ -98,7 +98,7 @@ collect_partitions() {
         [[ "$LABEL"  == "$OEMDRV_LABEL"                ]] && continue
         [[ -z "$PKNAME"                                ]] && continue
 
-        local disk="/dev/$PKNAME"
+        local disk="/dev/${PKNAME##*/}"
         local pnum
         pnum=$(cat /sys/class/block/"${NAME##/dev/}"/partition 2>/dev/null) || continue