sweetberry: allow larger sense resistors
sweetberry: allow larger sense resistors

Currently sweetberry hits an integer truncation issue
at 2.4 ohm when uA per div goes below 1. We can use 100ths
of a uA as the current per div scale.

BRANCH=None
BUG=chromium:608039
TEST=log from sweetberry with 10 ohm config.

Signed-off-by: Nick Sanders <f4566bb3c90c0bf5fa0906b296b1da45051a62ee@chromium.org>

Change-Id: I9e9216230329483fd0bfcb44ce23cd15bae864b3
Reviewed-on: https://chromium-review.googlesource.com/577051
Commit-Ready: Nick Sanders <f4566bb3c90c0bf5fa0906b296b1da45051a62ee@chromium.org>
Tested-by: Nick Sanders <f4566bb3c90c0bf5fa0906b296b1da45051a62ee@chromium.org>
Reviewed-by: Nick Sanders <f4566bb3c90c0bf5fa0906b296b1da45051a62ee@chromium.org>

coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec