tlcl: tpm2: fix unmarshal_u32 return value
tlcl: tpm2: fix unmarshal_u32 return value

Before the fix, unmarshal_u32 returned only 16 bits of the value.

BRANCH=none
BUG=chrome-os-partner:55210
TEST=boot on keving, verify that 'tpmc getvf' correctly returns
     the 'orderly' flag (bit 31 of a 32-bit flags value)

Change-Id: I182abdd78a6bdcbc21fe631492559099caeb934f
Reviewed-on: https://chromium-review.googlesource.com/362994
Commit-Ready: Andrey Pronin <53bbebe6910b11f7aa2d1daaa466658eb4cba5f2@chromium.org>
Tested-by: Andrey Pronin <53bbebe6910b11f7aa2d1daaa466658eb4cba5f2@chromium.org>
Reviewed-by: Vadim Bendebury <5515d6d2d0829cbe0dd0dcf2094aaded06d58514@chromium.org>

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