Remove unused btm_cb.is_inquiry

Bug: 322230000
Test: mma -j32
Flag: EXEMPT, no logical change
Change-Id: I98575c1796a40045b88e9a3a6435aae8e13464f2
diff --git a/system/stack/acl/btm_acl.cc b/system/stack/acl/btm_acl.cc
index 58b2975..12c53b4 100644
--- a/system/stack/acl/btm_acl.cc
+++ b/system/stack/acl/btm_acl.cc
@@ -529,7 +529,6 @@
 }
 
 void btm_acl_update_inquiry_status(uint8_t status) {
-  btm_cb.is_inquiry = status == BTM_INQUIRY_STARTED;
   BTIF_dm_report_inquiry_status_change(status);
 }
 
diff --git a/system/stack/btm/btm_int_types.h b/system/stack/btm/btm_int_types.h
index 0f8c881..cb165de 100644
--- a/system/stack/btm/btm_int_types.h
+++ b/system/stack/btm/btm_int_types.h
@@ -157,7 +157,6 @@
 
   uint16_t disc_handle{0};          /* for legacy devices */
   uint8_t disc_reason{0};           /* for legacy devices */
-  bool is_inquiry{false}; /* true, if inquiry is in progess */
 
   fixed_queue_t* sec_pending_q{nullptr}; /* pending sequrity requests in
                                             tBTM_SEC_QUEUE_ENTRY format */