clk: ux500: Rewrite PRCMU clocks to use clk_hw_*

clk: ux500: Rewrite PRCMU clocks to use clk_hw_*

This rewrites all the u8500 PRCMU clocks and helper functions to
handle clocks using struct clk_hw rather than struct clk, as is
normal for modern clock drivers.

Use clk_hw_register(), of_clk_add_hw_provider() and stack all the
clocks into a compile-time dynamic array of
struct clk_hw_onecell_data.

Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20220414221751.323525-5-linus.walleij@linaro.org
Signed-off-by: Stephen Boyd <sboyd@kernel.org>