Change import of MAE VIT

In Prithvi_run_inference.py the MaskedAutoencoderViT gets imported from mae.models_mae (the original mae repo I assume) while it seems like it should get imported from Prithvi.py since it got altered w.r.t the implementation of the original repo.

Prithvi_run_inference.py

@@ -9,8 +9,7 @@ import torch
 import yaml
 from einops import rearrange
 
-from mae.models_mae import MaskedAutoencoderViT
-
+from Prithvi import MaskedAutoencoderViT
 
 NO_DATA = -9999
 NO_DATA_FLOAT = 0.0001