ectool: Fix incorrect fan numbers from ectool
ectool: Fix incorrect fan numbers from ectool

Return 0 if the board does not need fan indicated
by EC_FEATURE_PWM_FAN.

BRANCH=None
BUG=chrome-os-partner:55090
TEST=make buildall -j;
     in reef command "ectool pwmgetnumfans" returns 0

Change-Id: I7b59d266532622607c61fe3e7dd1bd0cc8ea9766
Signed-off-by: Divya Sasidharan <dba62b20a5027527f6399518550d13252dee26fc@intel.com>
Reviewed-on: https://chromium-review.googlesource.com/359069
Commit-Ready: Divya S Sasidharan <dba62b20a5027527f6399518550d13252dee26fc@intel.com>
Tested-by: Divya S Sasidharan <dba62b20a5027527f6399518550d13252dee26fc@intel.com>
Reviewed-by: Shawn N <5259333ce42e3ace6a73988cec7115ed9d3a661a@chromium.org>

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