modules: cmsis-dsp: add cmsis-dsp module
Use CMSIS-DSP from its new realm. This also changes change how you
initialize FFT tables as well to use arm_cfft_init_64_f32 if you
know the FFT size in advance rather than the generic initialization
arm_cfft_init_f32.
Signed-off-by:
Ryan McClelland <ryanmcclelland@meta.com>
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