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Add WARN_ONCE definition to allow single time notification of warnings to the user. Taken from Linux kernel (4.17) with slight changes (Removed __section(.data.once)) Signed-off-by: Ramon Fried <ramon.fried@gmail.com> [trini: Drop the musb and dwc3 compat versions] Signed-off-by: Tom Rini <trini@konsulko.com>