Change temp approximations to be accurate

We need to use a more accurate ratio of celsius to fahrenheit along
with better min/max temperature conversions so if a client sets the
value using standard conversion or using this table, they will produce
the same result.

Bug: 313720524
Test: atest CtsCarTestCases:CarPropertyManagerTest
Change-Id: I80a45962e7025c9c529381fd3522839f78bf413f