Fix inability to set bitrate in latest AMD driver

[MikhailAMD]

Fixed issue: in enc_AMF plug-in bit rate cannot be set with the latet AMD driver. Cause: AMF rate control mode enum now has a new value. When this value received from GetPropertyInfo() the enum translation function throws exception terminating plug-in initialization. Fix: unknown values in enums should be ignored. Applied for all enum translations.

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