vboot2: ignore physical dev switch in case virtual mode is configured

vboot2: ignore physical dev switch in case virtual mode is configured

It is better to explicitly disable the call to read the physical
switch setting than to leave it up to implementation. In fact no
implementation would be even required.

BRANCH=none
BUG=none
TEST=verified that storm works as expected

Change-Id: I4b39827dba34ec0124960d0634e45d4554252d9b
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: c9fd014f1bfec6570b20ed8fed16d14d7e4e11b9
Original-Change-Id: I5d6d223f0c684e105a5e3d0b407e0fb181c7a7df
Original-Signed-off-by: Vadim Bendebury <vbendeb@chromium.org>
Original-Reviewed-on: https://chromium-review.googlesource.com/261588
Original-Reviewed-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: http://review.coreboot.org/9876
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>