ANDROID: enable db845c kleaf build.

Kleaf replaces build.sh. Define db845c target in Bazel
so it may be built with the following command.

Kleaf requires the list of in-tree kernel modules to be
listed explicitly.

Test: tools/bazel run //common:db845c_dist

Bug: 229913034

Change-Id: I725d7d6c4e9897cad58f970821cd2b222ac64889
Signed-off-by: Yifan Hong <elsk@google.com>