util/chromeos/crosfirmware: Handle "broken" recovery images

Several recovery images for newer ChromeOS boards fail in
extract_partition() due to parted detecting that there are overlapping
partitions, and therefore failing to print the partition layout
(this is potentially a parted bug; requries further investigation).

To work around this, fall back to using fdisk, making the assumption
that ROOT-A is always partition #3, and calculate the partition
start and size using the sector size.

Test: successfully extract coreboot firmware images from recovery
images which previously failed to extract (fizz, octopus, volteer).

Change-Id: I03234170ba0544af9eb0879253f0a8e0e7bf33f5
Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/61616
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin Roth <martinroth@google.com>

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