Revert "wifi: Add systemAPi:setSubscriberId in NetworkAgentConfig"

This reverts commit 7521c2277af5a0c23cd028d15aaa59de5c0cd8fc.

Reason for revert: After discussion, we prefer to add a field in NetworkCapabilities instead. Sorry for inconvenience.

Change-Id: I2e8840a797df9d1594f2b8b576bcd45beb184fca
2 files changed