timing: Fix the Eclipse build errors in IStatisticsAnalysis

Fix the Eclipse build errors [1] in IStatisticsAnalysis. Also fix the
warning [2] while there (line 64). Based on Eclipse 2023-06 (4.28.0).

[1] 'E' is not a valid substitute for the type parameter '@nonnull E'.
[2] annotation is redundant with a default that applies to this location

Change-Id: I608cc47d7e8b957bf1aa789a56f46d8e24e31932
Signed-off-by: Marco Miller <marco.miller@ericsson.com>
Reviewed-on: https://git.eclipse.org/r/c/tracecompass/org.eclipse.tracecompass/+/203544
Tested-by: Trace Compass Bot <tracecompass-bot@eclipse.org>
Tested-by: Bernd Hufmann <bernd.hufmann@ericsson.com>
Reviewed-by: Bernd Hufmann <bernd.hufmann@ericsson.com>

analysis/org.eclipse.tracecompass.analysis.timing.core/src/org/eclipse/tracecompass/analysis/timing/core/statistics/IStatisticsAnalysis.java

@@ -26,7 +26,7 @@
  * @author Matthew Khouzam
  * @since 5.2
  */
-public interface IStatisticsAnalysis<E> {
+public interface IStatisticsAnalysis<@NonNull E> {
 
     /**
      * Get the total statistics for a specific range. If the range start is
@@ -61,7 +61,7 @@ public interface IStatisticsAnalysis<E> {
      * @return The per type statistics, or <code>null</code> if data source is
      *         invalid or if the request is canceled
      */
-    Map<@NonNull String, IStatistics<@NonNull E>> getStatsPerTypeForRange(long start, long end, IProgressMonitor monitor);
+    Map<String, IStatistics<@NonNull E>> getStatsPerTypeForRange(long start, long end, IProgressMonitor monitor);
 
     /**
      * Get the statistics for the time range, all categories aggregated