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v1: add osssys v4_2 register offset and shift masks header files. vega20 and arcturus will refer to these ip headers. (Hawking) v2: clean up osssys v4_2 registers (Alex) Signed-off-by: Hawking Zhang <Hawking.Zhang@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com> Acked-by: Christian König <christian.koenig@amd.com> Acked-by: Felix Kuehling <Felix.Kuehling@amd.com> Reviewed-by: Dennis Li <Dennis.Li@amd.com> Reviewed-by: Feifei Xu <Feifei.Xu@amd.com>