clk: Check that composite clock's div has set_rate()

It's possible for composite clocks to have a divider that does not
implement set_rate() operation. For example, sandbox_clk_composite()
registers composite clock with a divider that only has get_rate().
Currently clk_composite_set_rate() only checks thate rate_ops are
present, so for sandbox it will cause NULL dereference during
clk_set_rate().

This patch adds rate_ops->set_rate check tp clk_composite_set_rate().

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

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