Support for reading LE specific controller features

Support for reading LE specific controller features via get adapter properties
API

Change-Id: Ia0b813be45fb826ce27d1d7a31ca41650d7286dd
diff --git a/bta/include/bta_api.h b/bta/include/bta_api.h
index 4bb305d..0b7d960 100644
--- a/bta/include/bta_api.h
+++ b/bta/include/bta_api.h
@@ -591,6 +591,7 @@
 // btla-specific --
 #define BTA_DM_DEV_UNPAIRED_EVT         23
 #define BTA_DM_HW_ERROR_EVT             24      /* BT Chip H/W error */
+#define BTA_DM_LE_FEATURES_READ         25      /* Cotroller specific LE features are read */
 typedef UINT8 tBTA_DM_SEC_EVT;
 
 /* Structure associated with BTA_DM_ENABLE_EVT */