Literal enum values does not respect the use_enum_values config

[eistaa]

Bug

Output of python -c "import pydantic.utils; print(pydantic.utils.version_info())":

             pydantic version: 1.6.1
            pydantic compiled: True
                 install path: <path-to-virtualenv>/lib/python3.8/site-packages/pydantic
               python version: 3.8.1 (default, Dec 29 2019, 16:51:17)  [GCC 9.2.0]
                     platform: Linux-5.7.2-arch1-1-x86_64-with-glibc2.29
     optional deps. installed: ['typing-extensions']

When combining enum values with a Literal typing the use_enum_values config is not respected:

from enum import Enum
from typing import Literal

from pydantic import BaseModel

class FruitEnum(Enum):
    pear = 'pear'
    banana = 'banana'

class CookingModel(BaseModel):
    fruit: FruitEnum

    class Config:
        use_enum_values = True

class LiteralCookingModel(BaseModel):
    fruit: Literal[FruitEnum.pear]

    class Config:
        use_enum_values = True

cm = CookingModel(fruit=FruitEnum.pear)
print(cm.dict())
# outputs: {'fruit': 'pear'}

lcm = LiteralCookingModel(fruit=FruitEnum.pear)
print(lcm.dict())
# outputs: {'fruit': <FruitEnum.pear: 'pear'>}

[PrettyWood]

Closed by #1838