gen_nodes: fix YAML indentation in pcipassthrough template

The template was generating malformed YAML with improper indentation
and missing newlines between passthrough entries. This caused parsing
errors: "Colons in unquoted values must be followed by a non-space
character."

Fixed by:
- Removing the trailing whitespace stripping after 'pcipassthrough:'
- Ensuring proper indentation for all passthrough entries
- Maintaining consistent whitespace control throughout the macro

The generated YAML now correctly produces a single 'pcipassthrough'
key with properly indented sub-entries for all devices.

Generated-by: Claude AI
Reviewed-by: Chuck Lever <[email protected]>
Signed-off-by: Luis Chamberlain <[email protected]>

Author: mcgrof

playbooks/roles/gen_nodes/templates/gen_nodes_list.j2

@@ -5,14 +5,13 @@
 {%- if not ns.has_devices -%}
 {%- set ns.has_devices = true %}
     pcipassthrough:
-{% endif -%}
-      passthrough{{ ns.device_index | string }}:
+{% endif %}      passthrough{{ ns.device_index | string }}:
         domain: {{ d.domain }}
         bus: {{ d.bus }}
         slot: {{ d.slot }}
         function: {{ d.function }}
-{%- set ns.device_index = ns.device_index + 1 -%}
-{%- endif %}
+{% set ns.device_index = ns.device_index + 1 -%}
+{%- endif -%}
 {%- endfor -%}
 {%- endmacro -%}
 {%- macro gen_pci_passthrough( device_list ) -%}