RDKEMW-20795: Bring VPAAMP-457 changes to middleware-player-interface

[psiva01]

Description

Aamp commit 2da7d5d

Instead of rewriting the MPEGTS field in the VTT byte stream (fragile header surgery), the PTS offset is pushed into the subtec channel as a signed time offset, matching the pattern already used on the DASH path.

Cherry-picked from rdkcentral/aamp@2da7d5d

Additional Context

No response

Definition of Done (DoD)

Please complete the following Middleware Layer Integration checklist items to ensure all requirements for changes to be merged.

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