arm: socfpga: scan: Staticize scan_mgr_io_scan_chain_prg()
This function is never used outside of scan_manager.c , so make it static.
Zap the prototype in scan_manager.h and move the documentation above the
function. Make the documentation kerneldoc compliant.
Signed-off-by: NMarek Vasut <marex@denx.de>
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