Remove tBTM_CB::tBTM_BLE_CB::tBTM_BLE_INQ_CB::tx_power

Towards readable code

Bug: 163134718
Tag: #refactor
Test: acts -tc BleCocTest
Test: ble paired 2 phones

Change-Id: I5ba9d8908c249e53976567af258deb0ce8e218d5
diff --git a/system/stack/btm/btm_ble_int_types.h b/system/stack/btm/btm_ble_int_types.h
index 59142ec..8f021f7 100644
--- a/system/stack/btm/btm_ble_int_types.h
+++ b/system/stack/btm/btm_ble_int_types.h
@@ -137,7 +137,6 @@
   alarm_t* inquiry_timer;
   bool scan_rsp;
   uint8_t state; /* Current state that the inquiry process is in */
-  int8_t tx_power;
 } tBTM_BLE_INQ_CB;
 
 /* random address resolving complete callback */