doc: allow warnings in Sphinx for DTS

Sphinx-autodoc issues warnings about some symbols due to bad autodoc
"automock"ing when optional dependencies are missing:

Warning, treated as error:
	Failed to get a method signature for
	framework.config.TestSuiteConfig.convert_from_string:
	<classmethod(<function TestSuiteConfig.convert_from_string
	at 0x7f1a4ec10790>)> is not a callable object

The current meson setup allows to treat warnings as errors, halting the
process and exiting early. Given these warnings should be ignored, this
patch removes this behavior. Until optional dependencies are detected,
warnings for DTS API docs will be checked manually as part of the DTS
approval process.

Fixes: 6597fa4 ("dts: add autodoc Pydantic")

Signed-off-by: Luca Vizzarro <[email protected]>

doc/api/dts/meson.build

@@ -12,9 +12,6 @@ if python_ver_satisfied != 0
 endif
 
 extra_sphinx_args = ['-E', '-c', join_paths(doc_source_dir, 'guides')]
-if get_option('werror')
-    extra_sphinx_args += '-W'
-endif
 
 # DTS docs are generated inside main Doxygen docs build directory
 # DTS docs relies on main docs to install it so does not define install dir