Remove unnecessary whitespace from ptpinstance template

Removed unnecessary whitespace from the ptpinstance template which was
resulting in poor formatting of the [interface] section of ptp instance
files.

This change does not affect functionality, it just cleans up the
resulting file for a consistent appearance.

Test Plan:
PASS: Verify resulting ptp instance files are formatted correctly

Story: 2010723
Task: 49446

Change-Id: I518433c084fef14d46b3468e30128c26d8468b47
Signed-off-by: Cole Walker <cole.walker@windriver.com>

puppet-manifests/src/modules/platform/templates/ptpinstance.conf.erb

@@ -27,9 +27,6 @@
 <%- interface['parameters'].each do |key,value| -%>
 <%= key %> <%= value %>
 <%- end -%>
-
-
-
 <%- end -%>
 <%- end -%>
 <%- end -%>