autotest: fixup MMC power-down checking.

Different platforms can take advantage of different levels of
power-savings in the MMC.  CL allows test to check acceptable ranges
for certain fields by including operators for checking.

BUG=chromium-os:34876
TEST=run it on several different x86 platforms.

Change-Id: Ia4e546ed654ac426a76b741815cb1c8e253a70fe
Reviewed-on: https://gerrit.chromium.org/gerrit/37599
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>
Commit-Ready: Todd Broch <tbroch@chromium.org>
Tested-by: Todd Broch <tbroch@chromium.org>
1 file changed