clk: renesas: r9a06g032: Name anonymous structs

clk: renesas: r9a06g032: Name anonymous structs

Clarify the content of the r9a06g032_clkdesc structure by naming the
remaining anonymous structures defined inside.  Renaming each field and
updating the doc then becomes necessary in order to avoid name
duplications and kdoc warnings.

Signed-off-by: Ralph Siemsen <ralph.siemsen@linaro.org>
Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20230913203805.465780-2-ralph.siemsen@linaro.org
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>