missing support for DW_TAG_enumeration_type

[nickdesaulniers]

I just noticed that @nathanchance reported here:

$ $ python3 ../../github/frame-larger-than/frame_larger_than.py drivers/gpu/drm/amd/amdgpu/../display/dc/dml/dcn20/display_mode_vba_20.o dml20_ModeSupportAndSystemConfigurationFull
Unsupported type info for DW_TAG_enumeration_type, implement me!
DIE DW_TAG_enumeration_type, size=12, has_children=True
    |DW_AT_type        :  AttributeValue(name='DW_AT_type', form='DW_FORM_ref4', value=75, raw_value=75, offset=638)
    |DW_AT_name        :  AttributeValue(name='DW_AT_name', form='DW_FORM_strp', value=b'dm_validation_status', raw_value=2265, offset=642)
    |DW_AT_byte_size   :  AttributeValue(name='DW_AT_byte_size', form='DW_FORM_data1', value=4, raw_value=4, offset=646)
    |DW_AT_decl_file   :  AttributeValue(name='DW_AT_decl_file', form='DW_FORM_data1', value=1, raw_value=1, offset=647)
    |DW_AT_