[PATCH v1] clk: Add clk_composite_set_rate_and_parent

On 04/12, Heiko Stuebner wrote:

I remember having clocks not overflow their target rate came up in some ELC 
talk last week (probably in Stephens Qualcomm-kernel-talk) and a general 
solution might need some changes closer to the core.

Yep. It's on the list. Hopefully coordinated clk rate changes
will help here. Composite clks are sort of already coordinated
rates in a minor form though.

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