dts: gen_defines.py bails out on new path property type

[b0661]

Describe the bug

gen_defines.py when provided with a property of type 'path' (introduced in #21625) bails out with:

Traceback (most recent call last):
  File "/zephyr/scripts/dts/gen_defines.py", line 810, in <module>
    main()
  File "/zephyr/scripts/dts/gen_defines.py", line 57, in main
    write_props(node)
  File "/zephyr/scripts/dts/gen_defines.py", line 220, in write_props
    write_phandle_val_list(prop)
  File "/zephyr/scripts/dts/gen_defines.py", line 562, in write_phandle_val_list
    for i, entry in enumerate(prop.val):
TypeError: 'Node' object is not iterable
CMake Error at /zephyr/cmake/dts.cmake:207 (message):
  new extractor failed with return code: 1
Call Stack (most recent call first):
  /zephyr/cmake/app/boilerplate.cmake:460 (include)
  CMakeLists.txt:22 (include)

To Reproduce
See above.

Expected behavior

gen_defines.py to handle 'path' type properties properly.

The assumption in

zephyr/scripts/dts/gen_defines.py

Line 219 in 7cb7465

else: # prop.type == "phandle-array"

is not valid anymore. There is now also a 'path' type property.

Impact
Annoyance

Screenshots or console output
N/A

Environment (please complete the following information):

• Commit 7cb7465

Additional context
N/A