Fix Ulysses PEFT test (#7784)

Fix an issue with Ulysses PEFT test. This unblocks the full CI test.

Author: tohtana

tests/unit/ulysses_alst/test_ulysses_sp_hf.py

@@ -228,7 +228,7 @@ def __init__(self, config):
         assert mpu is not None
 
         # Verify that the sequence parallel groups are initialized
-        sp_group = groups._get_sequence_parallel_group()
+        sp_group = mpu.get_sequence_parallel_group()
         assert sp_group is not None
-        sp_world_size = groups._get_sequence_parallel_world_size()
+        sp_world_size = mpu.get_sequence_parallel_world_size()
         assert sp_world_size == sequence_parallel_size