g: tell between C and D and P SKUs of the H1B2 chip

There are three different H1 B2 chips SKUs in the wild now, one
version is for clamshell Chromebooks, one is for experimental build of
Poppy and one for detachable devices.

The SKUs differ by some fuse settings, as outlined by the comment in
the code.

This patch maps fuse settings into the chip revision string and also
makes sure that the revision is determined once and then used for all
following invocations of system_get_chip_revision().

BRANCH=none
BUG=chrome-os-partner:59833
TEST=verified that on dev boards with three different H1 B2 SKUs the
      revision is reported as expected (B2-C, B2-D and B2-P).

Change-Id: I7d588d7326c28e9fa4921351254ad60a21c3f6b8
Signed-off-by: Vadim Bendebury <vbendeb@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/426344
Reviewed-by: Marius Schilder <mschilder@chromium.org>
Reviewed-by: Carl Hamilton <carlh@chromium.org>

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