Add TypeDefinition support for enumeration generation

TypeDefinition was not supported by generate_schema_enums.py, this
change is to support the 'TypeDefinition' generation from schema.

Tested:
'T

Add TypeDefinition support for enumeration generation

TypeDefinition was not supported by generate_schema_enums.py, this
change is to support the 'TypeDefinition' generation from schema.

Tested:
'TypeDefinition' fields in schema can be generated in generated files
with the change

Change-Id: Ibe61f65b905f2089f9e17a26fbd27e3ff1753166
Signed-off-by: Chandramohan Harkude <chandramohan.harkude@gmail.com>

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