arm: socfpga: scan: Introduce generic JTAG accessor
Introduce generic function for accessing the JTAG scan chains in the SCC manager. Make use of this function throughout the SCC manager to replace the ad-hoc writes to registers and make the code less cryptic. Signed-off-by: NMarek Vasut <marex@denx.de> Acked-by: NDinh Nguyen <dinguyen@opensource.altera.com>
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