add lerp cpu support for half (#105607)

Pull Request resolved: https://github.com/pytorch/pytorch/pull/105607
Approved by: https://github.com/albanD
diff --git a/test/test_mps.py b/test/test_mps.py
index ee8500b..0da3f7b 100644
--- a/test/test_mps.py
+++ b/test/test_mps.py
@@ -10471,7 +10471,7 @@
         'nn.functional.huber_loss',
         'true_divide', 'kron',
         'gradient', 'var', 'std', 'ldexp',
-        'linalg.vector_norm',
+        'linalg.vector_norm', 'lerp',
         'addr', 'var_mean',
         'var_mean_unbiased',
         'acosh', 'asinh', 'asin',