FROMPULL: scripts: zephyr_module: Tolerate symlinks

Currently, this script will blow up when given a symlink for a path (e.g.,
to a kconfig file).

This is annoying, as when wrapping the build system in a hermetic build
system like Bazel, Bazel likes to limit the input file set by creating
symlinks.

Resolve the path, if it is a file once resolved, then it's OK.

zephyrproject-rtos/zephyr#61352

BUG=b:274648575
TEST=CQ

Change-Id: Ic002946737bb41025e09b1b5dec33fb29dab7987
Signed-off-by: Jack Rosenthal <jrosenth@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/zephyr/+/4771184
Reviewed-by: Aaron Massey <aaronmassey@google.com>

scripts/zephyr_module.py

@@ -162,10 +162,10 @@
 def validate_setting(setting, module_path, filename=None):
     if setting is not None:
         if filename is not None:
-            checkfile = os.path.join(module_path, setting, filename)
+            checkfile = Path(module_path) / setting / filename
         else:
-            checkfile = os.path.join(module_path, setting)
-        if not os.path.isfile(checkfile):
+            checkfile = Path(module_path) / setting
+        if not checkfile.resolve().is_file():
             return False
     return True