fastboot: Workaround for touchbar hang on MBP 2016

fastboot will try to set usb configuration on connected
usb devices. When it tries to change the usb configuration
on iBridge device on MBP 2016 model, it hangs, and frozen
the touchbar. Skip set usb configuration.

Bug: https://code.google.com/p/android/issues/detail?id=231129
Change-Id: Ib055fc0524d26092555fc135588fa362e70eeb39
diff --git a/fastboot/usb_osx.cpp b/fastboot/usb_osx.cpp
index ee5d575..032ae31 100644
--- a/fastboot/usb_osx.cpp
+++ b/fastboot/usb_osx.cpp
@@ -92,7 +92,6 @@
     HRESULT result;
     SInt32 score;
     UInt8 interfaceNumEndpoints;
-    UInt8 configuration;
 
     // Placing the constant KIOUSBFindInterfaceDontCare into the following
     // fields of the IOUSBFindInterfaceRequest structure will allow us to
@@ -102,13 +101,6 @@
     request.bInterfaceProtocol = kIOUSBFindInterfaceDontCare;
     request.bAlternateSetting = kIOUSBFindInterfaceDontCare;
 
-    // SetConfiguration will kill an existing UMS connection, so let's
-    // not do this if not necessary.
-    configuration = 0;
-    (*dev)->GetConfiguration(dev, &configuration);
-    if (configuration != 1)
-        (*dev)->SetConfiguration(dev, 1);
-
     // Get an iterator for the interfaces on the device
     kr = (*dev)->CreateInterfaceIterator(dev, &request, &iterator);