fix(CI): update get_yaml_directory to return spec/std/isa/inst (#874)

With the latest folder structure updates, the previous logic for
resolving the YAML and JSON paths was outdated, causing LLVM-related
tests to always be skipped. This commit updates the test to use the
correct paths, ensuring that the tests run as intended and are no longer
erroneously skipped.

Signed-off-by: Artur Kovbasa <kovbasa@synopsys.com>

Author: k4neka

ext/auto-inst/parsing.py

@@ -49,7 +49,7 @@ def get_json_path():
 
 
 def get_yaml_directory():
-    return "arch/inst/"
+    return "spec/std/isa/inst"
 
 
 def load_inherited_variable(var_path, repo_dir):