sdk_version now creates a new variant, so the cc_genrules also need
sdk_version set.

Bug: b:149591340
Change-Id: I8c58cca2d4e73e9f123f968d47361e878743e1b8
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2131251Reviewed-by: Tim Van Patten <timvp@google.com>
Commit-Queue: Geoff Lang <geofflang@chromium.org>