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2018-12-06dm: Add Hardware Spinlock classBenjamin Gaignard
This is uclass for Hardware Spinlocks. It implements two mandatory operations: lock and unlock and one optional relax operation. Signed-off-by: Benjamin Gaignard <benjamin.gaignard@linaro.org> Reviewed-by: Simon Glass <sjg@chromium.org> Reviewed-by: Patrice Chotard <patrice.chotard@st.com>