verify_root_partition: Fix parsing of kernel boot args

'%U+1' has been changed to 'PARTUUID=%U/PARTNROFF=1' in
build_kernel_image.sh

BUG=chrome-os-partner:21860
TEST=Pass VerifySSDRootPartition on Peppy

Change-Id: I19b7a54d9f29f5e8ea2819250965a1f2c187902e
Reviewed-on: https://gerrit.chromium.org/gerrit/65718
Reviewed-by: Jay Kim <yongjaek@chromium.org>
Commit-Queue: Gediminas Ramanauskas <gedis@chromium.org>
Tested-by: Gediminas Ramanauskas <gedis@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/65796
Reviewed-by: Shawn Nematbakhsh <shawnn@chromium.org>
Reviewed-by: Cheng-Yi Chiang <cychiang@chromium.org>
1 file changed