geekbench: Add support for Geekbench 6

Add support for Geekbench 6 as a workload on Android.
This commit adds 6.*.* as a valid version for the Geekbench workload and
updates the UIAuto apk accordingly.

It also refactors the update_result function seeing as the one
originally used for GB4 can now be used for 4, 5 and 6 and so it makes
more sense to treat it as a 'generic' update_result function. The
functionality should stay the same.

Backwards compatibility with GB2 & GB3 should be maintained.

wa/workloads/geekbench/uiauto/app/src/main/java/com/arm/wa/uiauto/geekbench/UiAutomation.java

@@ -96,6 +96,7 @@ public class UiAutomation extends BaseUiAutomation {
                     break;
                 case 4:
                 case 5:
+                case 6:
                     runCpuBenchmarks(isCorporate);
                     waitForResultsv3onwards();
                     break;