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Refactor code such that ras block decides the default mca debug mode,
and not swsmu block.

By default mca debug mode is set to false.

v2: squash in uninitialized value fix (Alex)
Signed-off-by: Lijo Lazar <lijo.lazar@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>