clk: fsl-sai: use devm_clk_hw_register_composite_pdata()

Simplify the driver by using that helper and drop the remove() function.

Signed-off-by: Michael Walle <michael@walle.cc>
Link: https://lore.kernel.org/r/20201105192746.19564-4-michael@walle.cc


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