platform: msm_shared: add enum to select pm660.

add macro in pmic type to select pm660.

Change-Id: I71c59e70588d28fa3bf44a37aaada302656a4b36
diff --git a/platform/msm_shared/smem.h b/platform/msm_shared/smem.h
index e9e3515..d72d9b3 100644
--- a/platform/msm_shared/smem.h
+++ b/platform/msm_shared/smem.h
@@ -141,6 +141,7 @@
 	PMIC_IS_PMI8950   = 17,
 	PMIC_IS_PMI8994   = 10,
 	PMIC_IS_PMI8996   = 19,
+	PMIC_IS_PM660     = 27,
 } pm_model_type_bfly;
 
 struct smem_board_info_v3 {