[Transformation] Remove warning about clock period in prepare ip transformation

src/finn/transformation/fpgadataflow/prepare_ip.py

@@ -27,7 +27,6 @@
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 import os
-import warnings
 import finn.custom_op.registry as registry
 from finn.transformation import Transformation
 from finn.util.basic import make_build_dir
@@ -75,11 +74,6 @@ class PrepareIP(Transformation):
         super().__init__()
         self.fpgapart = fpgapart
         self.clk = clk
-        if float(clk) not in [5.0, 10.0, 20.0]:
-            warnings.warn(
-                """The chosen frequency may lead to failure due to clock divider
-                constraints."""
-            )
 
     def apply(self, model):
         for node in model.graph.node: