Add missing RDK_LOG_FATAL definition to fallback logger implementations

[Copilot]

The RDK_LOG_FATAL log level was referenced in rdkv_cdl_log_wrapper.h but undefined in fallback implementations, causing compilation failures when the real RDK logger isn't available.

Changes

• Added RDK_LOG_FATAL (value 6) to fallback log level definitions in both RDK_LOGGER conditional branches
• Updated RDK_LOG macros to handle FATAL level with appropriate prefix formatting
• Added definition to test mock for consistency

Files Modified

• rfcMgr/rdk_debug.h - Main fallback implementations
• rfcMgr/gtest/mocks/rdk_debug.h - Test mock

// Before: Missing FATAL level
#define RDK_LOG_ERROR 5
// After: Complete log level definitions
#define RDK_LOG_ERROR 5
#define RDK_LOG_FATAL 6

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