Add new enum to read BT maximum power

This change adds new property BT_PROP_MAX_POWER.

Change-Id: I85cfd19e0328eee11311db8ec878a52894cefaa8
diff --git a/include/btcommon_interface_defs.h b/include/btcommon_interface_defs.h
index c50608f..fef59bc 100644
--- a/include/btcommon_interface_defs.h
+++ b/include/btcommon_interface_defs.h
@@ -63,6 +63,7 @@
   BT_PROP_A2DP_MCAST_TEST,
   BT_PROP_TWSP_STATE,
   BT_PROP_STACK_TIMEOUT,
+  BT_PROP_MAX_POWER,
 
   // FM PROPERTY
   FM_PROP_NOTCH_VALUE = 0x1000,