common svp (Secure Video Path) changes added and new gst-svp-ext interface used to move the SoC changes from Mediasession

[afranc083]

• Common SVP (Secure Video Path) feature is supported
• New gst-svp-ext interface is used to move the SoC specific changes from Mediasession. reference https://code.rdkcentral.com/r/plugins/gitiles/rdk/components/generic/gst_svp_ext
• CMake changes are done to ensure the Compilation with Realtek & Amlogic platform
• We are aligned with Common rdk-adapter. reference: https://github.com/rdkcentral/ThunderClientLibraries/blob/master/Source/ocdm/adapter/rdk/open_cdm_adapter.cpp

[CLAassistant]

All committers have signed the CLA.

[rdkcmf-jenkins]

b'## Copyright scan failure
Commit: 87502a8
Report detail: https://gist.github.com/rdkcmf-jenkins/f5458fd08e46905e1f320f0b9e48642e'

[rdkcmf-jenkins]

b'## Blackduck scan failure details

Summary: 0 violations, 0 files pending approval, 6 files pending identification.

• Protex Server Path: /home/blackduck/github/OCDM-Widevine/33/rdkcentral/OCDM-Widevine

• Commit: 87502a8

Report detail: gist'

[mhughesacn]

This is an opensourced repo and cannot contain confidential code from any party. Please remove the files immediately.