tflite: Add casts to std::min/std::max when comparing mis-matched types

[yennster]

On some targets, such as the STM32L4, type deduction fails for calls to std::min & std::max when comparing values with mis-matched types:

quantization_util.cpp:293:79: error: no matching function for call to 'min(double, float)'

quantization_util.cpp:293:79: note: deduced conflicting types for parameter 'const _Tp' ('double' and 'float')

This PR fixes this compilation error by casting <double> or <float> respectively to these type mis-matched std::min/std::max calls.

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[yennster]

@googlebot I signed it!

[yennster]

@abattery Ready for re-review