Add a missing case for BTA_DM_SEARCH_CANCEL_CMPL_EVT

Cancelling discovery was not handled properly in
btif_dm_search_services_evt and was causing crashes due to assert in
default case.

Bug: 31442085
Change-Id: If9a2c203730c9b06df5ff8d8e251f0c35addcb82
(cherry picked from commit 7df43240c4a7cf5ecd58a39f03d235bf52929d79)
diff --git a/btif/src/btif_dm.c b/btif/src/btif_dm.c
index 49fa274..f70e4fa 100644
--- a/btif/src/btif_dm.c
+++ b/btif/src/btif_dm.c
@@ -1554,6 +1554,10 @@
             /* fixme */
         break;
 
+        case BTA_DM_SEARCH_CANCEL_CMPL_EVT:
+            /* no-op */
+        break;
+
 #if (defined(BLE_INCLUDED) && (BLE_INCLUDED == TRUE))
         case BTA_DM_DISC_BLE_RES_EVT:
              BTIF_TRACE_DEBUG("%s:, services 0x%x)", __FUNCTION__,