Compiled with Default Target(LLVM) and Built with USE_MRVL=ON

[MNGanesan]

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Please review the fix:

It is a unique use-case to check the default target(LLVM), though TVM is built with BYOC(MRVL-ON) The config of Codegen(BYOC) contains default values for configuration/optons, it is extracted during _generate_codegen_args. In command line processing, validate_target_args checks if there are add-on options and it expects that particular target to be given explicitly in command line. Here, it is test for default (LLVM) path only, hence validate_target_args need to ignore the codegen's configuration