Revert "perf: Only use Red & IR arrays from function param"

[aromring]

Reverts #37
I have accepted the changes too soon. My bad. In fact, other functions in other parts of the code still use uint32_t incompatible with float. For example, maxim_max30102_read_fifo() in max30102.cpp or the original MAXIM algorithm in algorithm.cpp.

[0xMihir]

I used the Sparkfun library that could read into a float buffer. I'll try testing this code.