cr50: update size checks for U2F_ATTEST
cr50: update size checks for U2F_ATTEST

This CL updates verification of the message size in U2F_ATTEST after
adding userSecret field.

BUG=b:147020573
TEST=test_that <dut> firmware_Cr50U2fCommands

Change-Id: Ib1e9444fdd13ed27547df27aa9c2fed19ba59496
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/1984894
Tested-by: Andrey Pronin <53bbebe6910b11f7aa2d1daaa466658eb4cba5f2@chromium.org>
Commit-Queue: Andrey Pronin <53bbebe6910b11f7aa2d1daaa466658eb4cba5f2@chromium.org>
Reviewed-by: Vadim Bendebury <5515d6d2d0829cbe0dd0dcf2094aaded06d58514@chromium.org>
Reviewed-by: Andrey Pronin <53bbebe6910b11f7aa2d1daaa466658eb4cba5f2@chromium.org>

coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec