perf-source: fix acquisition of time for comm and mmap events

We were not getting the proper value for time. We need sample_id_all set
according to my cursory reading of the core.c in the kernel. Also, the
time is aligned to 64-bit (after the comm field).

lib/sp-perf-counter.h

@@ -31,18 +31,6 @@ typedef struct _SpPerfCounter SpPerfCounter;
 
 #pragma pack(push, 1)
 
-typedef struct
-{
-  /*
-   * These fields are available as the suffix only because we have specified
-   * them when creating attributes. Be careful about using them.
-   * Ideally, we would probably switch from using structures overlaid with
-   * casts to a reader design, which knows about the attributes.
-   */
-  guint32 pid, tid;
-  guint64 time;
-} SpPerfCounterSuffix;
-
 typedef struct
 {
   struct perf_event_header header;