platform2: Remove libchrome_crypto stand-alone library

Now the bits from libchrome_crypto are available as part of
libchrome meta-library.

BUG=None
TEST=./build_packages
CQ-DEPEND=CL:264053

Change-Id: I6c572cd9faa39291d19697ee68fdd2d59dad5117
Reviewed-on: https://chromium-review.googlesource.com/264054
Tested-by: Alex Vakulenko <avakulenko@chromium.org>
Trybot-Ready: Alex Vakulenko <avakulenko@chromium.org>
Reviewed-by: Bertrand Simonnet <bsimonnet@chromium.org>
Commit-Queue: Alex Vakulenko <avakulenko@chromium.org>
4 files changed