Staging: android: alarm: Rename pr_alarm to alarm_dbg

Rename a macro to make it explicit it's for debugging.

Use %s: __func__ instead of embedding function names.
Coalesce formats, align arguments.

Signed-off-by: Joe Perches <joe@perches.com>
Acked-by: David Rientjes <rientjes@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>