tools/parsetrace.py: Fix get_typesize bug in parsetrace.py

[Kaben123]

For the following code, we need to check 'type_attr.form'. type_attr = DIE.attributes["DW_AT_type"]
base_type_die = dwarfinfo.get_DIE_from_refaddr(xxx)

When type_attr.form==DW_FORM_ref_addr, 'type_attr.value' means global reference (across compilation units).

When type_attr.form==DW_FORM_ref4, 'type_attr.value' means local reference (within the same compilation unit).

Note: Please adhere to Contributing Guidelines.

Summary

Update this section with information on why change is necessary,
what it exactly does and how, if new feature shows up, provide
references (dependencies, similar problems and solutions), etc.

Impact

Update this section, where applicable, on how change affects users,
build process, hardware, documentation, security, compatibility, etc.

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Pure documentation changes can just be tested with make html
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[acassis]

@Kaben123 please read the CONTRIBUTING.md and fix the PR.

[simbit18]

Hi @Kaben123, can you please create a basic (initial) Documentation to parsetrace.py ?
https://github.com/apache/nuttx/blob/master/Documentation/components/tools/index.rst

[acassis]

@Kaben123 please include basic Documentation about parsetrace.py