PM: sleep: convert comment from kernel-doc to plain comment

PM: sleep: convert comment from kernel-doc to plain comment

Modify a non-kernel-doc comment to begin with /* instead of /**
so that it does not cause a kernel-doc warning.

power.h:114: warning: This comment starts with '/**', but isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst
 *      Auxiliary structure used for reading the snapshot image data and
power.h:114: warning: missing initial short description on line:
 *      Auxiliary structure used for reading the snapshot image data and

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Acked-by: Pavel Machek <pavel@ucw.cz>
Link: https://patch.msgid.link/20250111063107.910825-1-rdunlap@infradead.org
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>