[bazel] exclude foundry repo from Verilator build
[bazel] exclude foundry repo from Verilator build

HDL constructs in the foundry repo are preventing Verilator builds from
succeeding. This is addresses #15882 in the short term, by excluding the
foundry repo from Verilator sim binary builds.

Signed-off-by: Timothy Trippel <77eacc84f9735d3cbb55a271710be269fc3a5818@google.com>

lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan