[bazel] Leave opentitantool timeout unset
[bazel] Leave opentitantool timeout unset

This was set to be 3600s to be compatible with the maximum test timeout
associated with bazel timeouts. This commit removes the timeout
argument to let bazel kill tests when they reach their timeouts.

Signed-off-by: Alphan Ulusoy <23b245cc5a07aacf75a9db847b24c67dee1707bf@google.com>

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