clk: Bail out when calculating phase fails during clk registration

Bail out of clk registration if we fail to get the phase for a clk that
has a clk_ops::get_phase() callback. Print a warning too so that driver
authors can easily figure out that some clk is unable to read back phase
information at boot.

Cc: Douglas Anderson <[email protected]>
Cc: Heiko Stuebner <[email protected]>
Suggested-by: Jerome Brunet <[email protected]>
Signed-off-by: Stephen Boyd <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]
Acked-by: Jerome Brunet <[email protected]>

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