clk: samsung: Improve kernel-doc comments

Unify and improve the style of kernel-doc comments in Samsung CCF
framework. Resemble more idiomatic style described in [1] and commonly
used throughout most of the kernel code.

[1] Documentation/doc-guide/kernel-doc.rst

Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Tested-by: Randy Dunlap <rdunlap@infradead.org>
Link: https://lore.kernel.org/r/20231109190925.2066-2-semen.protsenko@linaro.org


Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>