vboot: Fixes bug in get_gbb_flags.sh -e
vboot: Fixes bug in get_gbb_flags.sh -e

get_gbb_flags.sh outputs incorrect information because the hex number is not
parsed correctly.

BUG=none
TEST=Manual
BRANCH=none

Change-Id: Ie6428a5c50d48ae5d732b31d7a8e7b314653c2d9
Signed-off-by: Rob Barnes <3ced0940a2329ce70499686f01d3d60685ec66ed@google.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/vboot_reference/+/2108286
Reviewed-by: Joel Kitching <c2feea8c1334a0d339e816ae4c7c9ecfa9b30a91@chromium.org>
Reviewed-by: Jack Rosenthal <d3f605bef1867f59845d4ce6e4f83b8dc9e4e0ae@chromium.org>
Commit-Queue: Jack Rosenthal <d3f605bef1867f59845d4ce6e4f83b8dc9e4e0ae@chromium.org>

coreboot/vboot,coreboot/vboot,coreboot/vboot,coreboot/vboot,coreboot/vboot