userclk: separate device independent from Agilex 7 configuration #3159
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The user clock frequency configuration protocol varies across devices. Move the Agilex 7 and Stratix 10 configuration sequences out of fpga_user_clk.c and into a new protocol-specific file.
There is almost no new logic here -- just cleanup before adding a new module to manage the Agilex 5 sequence. The only significant functional change in the PR is addition of a more rigorous check that the FPGA family is supported by the configuration tables.
Checked on Agilex 7 HW.