Simplify/clarify the get_surface_pressure_in_mbar() function

Instead of maintaining a rolling average and re-calculating it at each
stage, just calculate the surface_pressure average the natural way: as
the sum divided by the number of entries.

This results in a single rounding, rather than doing rounding multiple
times and possibly rounding wrong as a result.

Not that we care all that deeply about the LSB of the mbar value, but
the code is simpler and more obvious this way too.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

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