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[Why] Since x86 and dmcub are both little endian, byte swapping isn't necessary. Dmcu requires byte swapping as it is big endian. [How] Add flag to function definitions to determine if byte swapping is necessary. Signed-off-by: Wyatt Wood <wyatt.wood@amd.com> Reviewed-by: Anthony Koo <Anthony.Koo@amd.com> Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>