RDKTV-37015: platfromSupport is missing from dimmingMode capabilities

[anjuraveendran2024]

Reason For Change: platfromSupport is missing from getBacklightDimmingModeCaps
Test procedure: Mentioned in the ticket RDKTV-35827
Risks: Low
Signed-off-by: [email protected]

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Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.

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