Revert "(NATIVECPU) added #define for device binary target"

This reverts commit afa0525.

Author: uwedolinsky

include/ur_api.h

@@ -1224,12 +1224,6 @@ typedef enum ur_platform_backend_t {
 #define UR_DEVICE_BINARY_TARGET_AMDGCN "amdgcn"
 #endif // UR_DEVICE_BINARY_TARGET_AMDGCN
 
-///////////////////////////////////////////////////////////////////////////////
-#ifndef UR_DEVICE_BINARY_TARGET_NATIVE_CPU
-/// @brief Native CPU target
-#define UR_DEVICE_BINARY_TARGET_NATIVE_CPU "native_cpu"
-#endif // UR_DEVICE_BINARY_TARGET_NATIVE_CPU
-
 ///////////////////////////////////////////////////////////////////////////////
 /// @brief Device Binary Type
 typedef struct ur_device_binary_t {