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Many different architectures re-implemented the exact same code for `up_*delay` because it was originally written as architecture dependent code. Busy-waiting can be done regardless of architecture, so this commit moves that duplicated implementation to a common file with weak definitions so that individual architectures (see tc32) are still able to override the definition if needed/desired. Default implementation is not included if ARCH_TIMER is enabled, since it is more accurate and provides its own weak definitions to override. Signed-off-by: Matteo Golin <matteo.golin@gmail.com>