Replace memmove of PASESessionSerializable (#5029)
Replace memmove of PASESessionSerializable (#5029)

#### Problem

From https://github.com/project-chip/connectedhomeip/pull/3630/files#r520114117

#### Summary of Changes

Use (C++ default) assignment.

fixes #3761 - Add an operator= to SecurePairingSessionSerializable
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