refactor(qti): refactor RNG as a proper driver

Refactor QTI RNG as a proper driver rather than being present in
platform code aligning with common practice followed by other platforms.

Change-Id: I

refactor(qti): refactor RNG as a proper driver

Refactor QTI RNG as a proper driver rather than being present in
platform code aligning with common practice followed by other platforms.

Change-Id: I4c1f23b7ea2f17fdb71792319b4c403db542b757
Signed-off-by: Sumit Garg <sumit.garg@oss.qualcomm.com>

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