clk: Zero init clk_init_data in helpers

The clk_init_data struct needs to be initialized to zero for the new
parent_map implementation to work correctly. Otherwise, the member which
is available first will get processed.

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Link: https://lkml.kernel.org/r/20191115162901.17456-2-manivannan.sadhasivam@linaro.org


Signed-off-by: Stephen Boyd <sboyd@kernel.org>