ASoC: Make sure clk_init_data is fully initialized

Geert Uytterhoeven <geert+renesas@glider.be> says:

The clk_init_data structure contains several mutually-exclusive members
for different methods to specify the possible parents of a clock,
prompting drivers to initialize only the members they need.  However,
not initializing all members may cause subtle issues, which are only
exposed when CONFIG_INIT_STACK_ALL_PATTERN or CONFIG_INIT_STACK_NONE is
enabled.

Hence this series aims to make sure all members are fully initialized,
to avoid such bugs, and to prevent future breakage when converting
drivers to a different method for specifying the parents.

Part One[1] fixed all cases that I identified to be real bugs, in
response to a crash I saw on BeagleBone Black.

This series is the ASoC subpart of Part Two, which fixes remaining cases
that are currently harmless.  These are still fragile, and may cause
future breakage when converting drivers to a different method for
specifying the parents.

Thanks for your comments!

[1] "[PATCH treewide 0/5] clk: Make sure clk_init_data is fully
     initialized (part 1)"
    https://lore.kernel.org/cover.1787165329.git.geert+renesas@glider.be

Link: https://patch.msgid.link/cover.1787239902.git.geert+renesas@glider.be

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