PM: hibernate: Rework message printing in swsusp_save()

PM: hibernate: Rework message printing in swsusp_save()

The messages printed by swsusp_save() are basically only useful for
debug, so printing them every time a hibernation image is created at
the "info" log level is not particularly useful.  Also printing a
message on a failing memory allocation is redundant.

Use pm_deferred_pr_dbg() for printing those messages so they will only
be printed when requested and the "deferred" variant is used because
this code runs in a deeply atomic context (one CPU with interrupts
off, no functional devices).  Also drop the useless message printed
when memory allocations fails.

While at it, extend one of the messages in question so it is less
cryptic.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
[ rjw: Dropped a useless colon at the end of one of the messages ]
Link: https://patch.msgid.link/10750389.nUPlyArG6x@rafael.j.wysocki