Update/Fix for classification models

[fayejf]

1. Change self.log(tensorboard_logs) and remove the 'log' part in the return requested in PR #1707
2. Fix for logging for top-k acc metrics
3. Fix tarred dataloader for speech regression support

[okuchaiev]

just to confirm that this is not a bugfix for rc1?

[fayejf]

@okuchaiev Part of this (Point 2) should be fixed in RC but this might raise conflict and not very essential (just logging), so we decide to merge it to main. I could split it and merge to RC if it's better.

[titu1994]

Split this PR into two please. Bugfix to RC, logging to main. You can revert the RC patch from this PR and do it in another or vice-versa.

[fayejf]

@titu1994
Moved the following to RC in #1878. Could you please review it?

1. Change self.log(tensorboard_logs) and remove the 'log' part in the return requested in PR before regresion
2. Fix for logging for top-k acc metrics

Let wait for RC to merge to main and I will update self.log and bug fix for regression to avoid any conflict.

[fayejf]

Close this since first part has been merged in #1878 and second part #1907 is ready for review