vboot: check vb2_shared_data flags for manual recovery

vboot handoff should look at flags in struct vb2_shared_data when
translating flags to VBSD_BOOT_REC_SWITCH_ON because
VBSD_BOOT_REC_SWITCH_ON is supposed to indicate whether manual recovery was
triggered or not while vb2_sd->recovery_reason will be able to provide
that information only in some cases after CL:307586 is checked in.

For example, this fixes a recovery loop problem: Without this fix,
vb2_sd->recovery_reason won't be set to VB2_RECOVERY_RO_MANUAL when user
hits esc+refresh+power at 'broken' screen. In the next boot,
recovery_reason will be set to whatever reason which caused 'broken'
screen. So, if we check recovery_reason == VB2_RECOVERY_RO_MANUAL, we
won't set vb_sd->flags to VBSD_BOOT_REC_SWITCH_ON. That'll cause a
recovery loop because VbBootRecovery traps us again in the 'broken'
screen after not seeing VBSD_BOOT_REC_SWITCH_ON.

BUG=chromium:501060
BRANCH=tot
TEST=test_that -b veyron_jerry suite:faft_bios

Change-Id: I69a50c71d93ab311c1f7d4cfcd7d454ca1189586
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: d9679b02f6d21ed903bb02e107badb0fbf7da46c
Original-Change-Id: I3da642ff2d05c097d10db303fc8ab3358e10a5c7
Original-Signed-off-by: Daisuke Nojiri <dnojiri@chromium.org>
Original-Reviewed-on: https://chromium-review.googlesource.com/307946
Original-Reviewed-by: Randall Spangler <rspangler@chromium.org>
Reviewed-on: http://review.coreboot.org/12199
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

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