sdhci: Do not return error if removable device is not present

It turns out that the absence of a removable device should not be
considered an error - it is enough that the device is not added to the
list.

BRANCH=rambi
BUG=chrome-os-partner:26252

TEST=manual
  . verify that recovery boot works from both USB and SD

Change-Id: I1f6f1e299820d100f8e0f1665c082c2646e766b8
Signed-off-by: Vadim Bendebury <vbendeb@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/188130
Reviewed-by: Hung-Te Lin <hungte@chromium.org>
1 file changed