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Vboot firmware previously supported a rather complex audio looping library. Our original intent was to allow developers to flash a custom beep sequence / tune as an easter egg. We never fully supported that, but the code to allow it lived on. Get rid of that. Vboot also previously made no assumptions about the frequency of VbExGetTimer(), which was only used by the vboot_audio library. So it spent 10ms every boot measuring the frequency. Which is silly now, because depthcharge implements that as a microsecond timer. Get rid of that measurement and define the timer as a microsecond timer. BUG=chromium:611535 BRANCH=none TEST=make -j runtests; build bob firmware and boot it Change-Id: I350246874fb36b00149423696285cfcaca0fc526 Signed-off-by: Randall Spangler <rspangler@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/847311 Reviewed-by: Shelley Chen <shchen@chromium.org>