Use static constexpr for min/max
Use static constexpr for min/max

In sgx_random_buffers.h. When used from <algorithm>, the call to
min/max as class methods in a template can cause compilation errors.

PiperOrigin-RevId: 253924579
Change-Id: I435f95f0a7bfded7b0befe9618d0503c3050d254

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