RDKB-61864: Harden WebUI Login

[Ananth916]

Reason for change: Change the default passwd to factory passwd
Test Procedure: Verify the webui login
Risks: Medium

[anoopchelakkode]

We have a Tr181 in OneWiFi which can give the default password. Can we rely on it rather than PSM DB?

[anoopchelakkode]

Do we want to expose the tr181 and hashing logic in public GitHub? We can hide the parameters and the logic in CPC repo.

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