Fix the problem that the pool static property holds the View referenc…

[qiduhe]

…e, which causes Activity memory leak

PR Checklist:

• [ ] I have tested this extensively and it does not break any existing behavior.
• [ ] I have added/updated examples and tests for any new behavior.
• [ ] If this is a significant change, an issue has already been created where the problem / solution was discussed: [N/A, or add link to issue here]

PR Description

[hannesa2]

duplicate of https://github.com/PhilJay/MPAndroidChart/pull/4502