Remove the duplicate s2f_user0_clk and the unused s2f_usr0_mux define.

Fixes: f817c132 ("clk: socfpga: agilex: fix up s2f_user0_clk representation")
Cc: stable@vger.kernel.org
Signed-off-by: Dinh Nguyen <dinguyen@kernel.org>
Link: https://lore.kernel.org/r/20210916225126.1427700-1-dinguyen@kernel.orgSigned-off-by: Stephen Boyd <sboyd@kernel.org>