clk: check parent_name in clk_register to avoid confusing log_error() output

For some gate clocks and fixed clocks without a parent, calling
clk_register will print an useless error message indicating that parent
is missing. Fix that by gaurding log_xxx() with an if-statement.

Signed-off-by: Yang Xiwen <[email protected]>
Suggested-by: Sean Anderson <[email protected]>
Reviewed-by: Sean Anderson <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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