adb: make `adb reconnect` perform a USB reset.

Bug: http://b/128941083
Test: manual
Change-Id: Iaf46d2c46cc82b590768004486d119244591c8e2
diff --git a/daemon/usb_legacy.cpp b/daemon/usb_legacy.cpp
index 7ace59d..b65727a 100644
--- a/daemon/usb_legacy.cpp
+++ b/daemon/usb_legacy.cpp
@@ -307,6 +307,10 @@
     return 0;
 }
 
+void usb_reset(usb_handle* h) {
+    usb_close(h);
+}
+
 void usb_kick(usb_handle* h) {
     h->kick(h);
 }