[PT2][Quant] Use module partitions for conv2d and conv2d + relu (#102395)
In this diff we continue to use source partition for identifying node patterns
to annotate. Here we expand the usecase for conv2d+relu and conv2d
Differential Revision: [D46095329](https://our.internmc.facebook.com/intern/diff/D46095329/)
Pull Request resolved: https://github.com/pytorch/pytorch/pull/102395
Approved by: https://github.com/jerryzh168
