sh: pfc: Add config_reg_helper() function
Add a helper function for shared config reg access calculations. This allows us to reduce the amount of duplicated code, and at the same time prepare for a common place for future variable bitwidth config reg support. Signed-off-by: NMagnus Damm <damm@opensource.se> Signed-off-by: NPaul Mundt <lethal@linux-sh.org>
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