adb: switch from system_clock to steady_clock.

Test: treehugger
Change-Id: I10b884dc159a5ba624bc0f7ad53a402bffb14293
diff --git a/adb/client/usb_linux.cpp b/adb/client/usb_linux.cpp
index 81b8306..17b4db1 100644
--- a/adb/client/usb_linux.cpp
+++ b/adb/client/usb_linux.cpp
@@ -324,7 +324,7 @@
 
     h->urb_out_busy = true;
     while (true) {
-        auto now = std::chrono::system_clock::now();
+        auto now = std::chrono::steady_clock::now();
         if (h->cv.wait_until(lock, now + 5s) == std::cv_status::timeout || h->dead) {
             // TODO: call USBDEVFS_DISCARDURB?
             errno = ETIMEDOUT;