docs: dev/hardware: update libplatforminfo instructions

docs/dev/hardware.rst

@@ -119,10 +119,11 @@ required for adding a new target:
 Package adjustments
 '''''''''''''''''''
 
-One package that definitely needs adjustments for every new target added is ``libplatforminfo`` (to be found in
+One package that may need adjustments for new targets is ``libplatforminfo`` (to be found in
 `packages/gluon/libs/libplatforminfo <https://github.com/freifunk-gluon/packages/tree/master/libs/libplatforminfo>`_).
-Start with a copy of an existing platform info source file and adjust it for the new target (or just add a symlink if
-there is nothing to adjust). Then add the new target to the DEPENDS variable in the ``libplatforminfo`` package Makefile.
+If the new platform works fine with the definitions found in ``default.c``, nothing needs to be done. Otherwise,
+create a definition for the added target or subtarget, either by symlinking one of the files in the ``templates``
+directory, or adding a new source file.
 
 On many targets, Gluon's network setup scripts (mainly in the packages ``gluon-core`` and ``gluon-mesh-batman-adv-core``)
 won't run correctly without some adjustments, so better double check that everything is fine there (and the files