cherry: do not use the cached VBUS value
cherry: do not use the cached VBUS value

Ignore the cached value in case of the FRS happening and
let the cached VBUS status outdated.

BUG=b:234352018
TEST=unplug FRS hub with adapter connected, and the VBUS supplier
     disappeared.
BRANCH=cherry

Change-Id: Ie87734976fc24eb1618e166d9eca0462f97d6ab8
Signed-off-by: Eric Yilun Lin <2f2733c7206ea2b76bd2db1905cc5e8a75841c48@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/3747171
Auto-Submit: Eric Yilun Lin <2f2733c7206ea2b76bd2db1905cc5e8a75841c48@google.com>
Reviewed-by: Ting Shen <c671d3efec3d7e7e285f3788bf0d1ba4c8605b78@chromium.org>
Commit-Queue: Ting Shen <c671d3efec3d7e7e285f3788bf0d1ba4c8605b78@chromium.org>
Tested-by: Eric Yilun Lin <2f2733c7206ea2b76bd2db1905cc5e8a75841c48@google.com>

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