Forward GEP stride config packets

[guosran]

Summary

Addresses #292 with a minimized controller config-routing fix. This PR only updates ControllerRTL.py.

Changes

• Forward CMD_CONFIG_GEP_STRIDE packets to the tile control ring.
• Keep GEP stride handling consistent with CtrlMemDynamicRTL, which already accepts this command.

Validation

Part of the master-based small conv passing set.

CGRA_CONV_NI=2 CGRA_CONV_NJ=2 CGRA_CONV_YAML=validation/test/conv/conv_small.yaml \
python3 -m pytest cgra/test/CgraRTL_conv4x4_test_from_yaml.py::test_homogeneous_4x4_conv_combinational_mem_access -q --tb=short

[guosran]

GEP stride config packets need to be routed to the tile/control path just like other loop/config packets.

controller sends CMD_CONFIG_GEP_STRIDE
|
v
tile ctrl memory / element config path

Without this, generated conv configs can contain a stride update that never reaches the tile logic.