clk: composite: allow fixed rates & fixed dividers

The composite clock assumes that any clock implementing the .recalc_rate
callback will also implement .round_rate and .set_rate.  This is not
always true; the basic fixed-rate clock will only implement .recalc_rate
and a fixed-divider clock may choose to implement .recalc_rate and
.round_rate but not .set_rate.

Fix this by conditionally registering .round_rate and .set_rate
callbacks based on the rate_ops passed in to clk_composite_register.

Signed-off-by: Mike Turquette <[email protected]>
Cc: Prashant Gaikwad <[email protected]>
Tested-by: Emilio López <[email protected]>
Cc: Gregory CLEMENT <[email protected]>

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