discovery/plugins/ble: Reduce default log level for CoreBluetooth.

CoreBluetooth seems stable enough for now that we don't need the
chatty INFO logs by default, for now.

Change-Id: Ic35073f8aeb9fd0f2034da8175fd3f379dc6c6b9
diff --git a/lib/discovery/plugins/ble/corebluetooth/corebluetooth.go b/lib/discovery/plugins/ble/corebluetooth/corebluetooth.go
index f4710a9..b992ccd 100644
--- a/lib/discovery/plugins/ble/corebluetooth/corebluetooth.go
+++ b/lib/discovery/plugins/ble/corebluetooth/corebluetooth.go
@@ -31,7 +31,7 @@
 )
 
 /*
-#cgo CFLAGS: -x objective-c -fobjc-arc -DCBLOG_LEVEL=CBLOG_LEVEL_INFO
+#cgo CFLAGS: -x objective-c -fobjc-arc -DCBLOG_LEVEL=CBLOG_LEVEL_ERROR
 #cgo LDFLAGS: -framework Foundation -framework CoreBluetooth
 #import <CoreBluetooth/CoreBluetooth.h>
 #import "CBDriver.h"