RDKCOM-5343: RDKBDEV-3178: rbusFlagSync.sh: drop obsolete / unused script

[Nithishkumar-T]

Reason for change:
Code cleanup
Test Procedure: Sanity.
Risks: None.
Signed-off-by: Andre McCurdy [email protected]
Priority: P1

Change-Id: Iceae604484964b56ac116ad9484f782c60568c99 (cherry picked from commit 6ec2fce)

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