drivers/clk/clk_zynqmp.c: get rid of compiler warning for !CONFIG_CMD_CLK builds

When built without CONFIG_CMD_CLK, we get a warning about the unused
clk_names variable:

../drivers/clk/clk_zynqmp.c:153:27: warning: ‘clk_names’ defined but not used [-Wunused-const-variable=]
  153 | static const char * const clk_names[clk_max] = {

So also guard it with CONFIG_CMD_CLK to get rid of that.

Signed-off-by: Peter Korsgaard <[email protected]>
Reviewed-by: Quentin Schulz <[email protected]>
Signed-off-by: Michal Simek <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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