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Save a small amount of time when the USB resume is making the chip boot from deep-sleep by removing the verbose serial traces in main and increasing the usb initialization priority. This brings us from borderline timings wrt the USB specification to a reasonable margin. Signed-off-by: Vincent Palatin <vpalatin@chromium.org> BRANCH=none BUG=b:38160821 TEST=run on hotelgolf, go to deep-sleep on USB-suspend. On USB resume, measure the time from CPU boot to the end of usb_init using the CPU cycle count. We are shaving 1.3ms. Change-Id: Ia5bf69c0ca26748dec59a87f3908a5fe68296b36 Reviewed-on: https://chromium-review.googlesource.com/563206 Commit-Ready: Marius Schilder <mschilder@chromium.org> Tested-by: Marius Schilder <mschilder@chromium.org> Tested-by: Vincent Palatin <vpalatin@chromium.org> Reviewed-by: Marius Schilder <mschilder@chromium.org> Reviewed-by: Vadim Bendebury <vbendeb@chromium.org>