rtc: ac100: remove misuses of kernel-doc

Prevent kernel-doc warnings by changing "/**" to common comment
format "/*" in non-kernel-doc comments:

drivers/rtc/rtc-ac100.c:103: warning: This comment starts with '/**', but isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst
 * Clock controls for 3 clock output pins
drivers/rtc/rtc-ac100.c:382: warning: This comment starts with '/**', but isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst
 * RTC related bits

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Chen-Yu Tsai <wens@csie.org>
Cc: Alexandre Belloni <alexandre.belloni@bootlin.com>
Cc:  <linux-rtc@vger.kernel.org>
Link: https://lore.kernel.org/r/20240114231320.31437-1-rdunlap@infradead.org


Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>