fastboot: add AdbWinUsbApi as a required module

fastboot uses AdbWinUsbApi on Windows, let's keep it required.

Test: rm -rf out/host; mma fastboot and confirm AdbWinUsbApi is in out/
Bug: 36810152
Change-Id: Ica8b27cb1d0bca260f716dc61fdcea2ccc282623
diff --git a/fastboot/Android.mk b/fastboot/Android.mk
index 5610cc0..2c578a9 100644
--- a/fastboot/Android.mk
+++ b/fastboot/Android.mk
@@ -51,7 +51,7 @@
 
 LOCAL_SRC_FILES_windows := usb_windows.cpp
 LOCAL_STATIC_LIBRARIES_windows := AdbWinApi
-LOCAL_REQUIRED_MODULES_windows := AdbWinApi
+LOCAL_REQUIRED_MODULES_windows := AdbWinApi AdbWinUsbApi
 LOCAL_LDLIBS_windows := -lws2_32
 LOCAL_C_INCLUDES_windows := development/host/windows/usb/api