max1720x_battery: add debugfs node for model version

Add /d/maxfg/model_version

Bug: 329749072
Test: can read/write model version via debugfs
Change-Id: I34887617254aca40be5865e4637550425695a3c0
Signed-off-by: Spade Lee <[email protected]>
diff --git a/max_m5.h b/max_m5.h
index 44e0dc0..00a65b5 100644
--- a/max_m5.h
+++ b/max_m5.h
@@ -156,6 +156,7 @@
 /** ------------------------------------------------------------------------ */
 
 int max_m5_model_read_version(const struct max_m5_data *m5_data);
+int max_m5_model_write_version(const struct max_m5_data *m5_data, int version);
 int max_m5_model_get_cap_lsb(const struct max_m5_data *m5_data);
 int max_m5_reset_state_data(struct max_m5_data *m5_data);
 int max_m5_needs_reset_model_data(const struct max_m5_data *m5_data);