Reorganize test dir to ensure test of installed pkg

tests/lib/cpuifs/axi4lite/__init__.py

@@ -0,0 +1,18 @@
+from ..base import CpuifTestMode
+
+from peakrdl.regblock.cpuif.axi4lite import AXI4Lite_Cpuif, AXI4Lite_Cpuif_flattened
+
+class AXI4Lite(CpuifTestMode):
+    cpuif_cls = AXI4Lite_Cpuif
+    rtl_files = [
+        "axi4lite_intf.sv",
+    ]
+    tb_files = [
+        "axi4lite_intf.sv",
+        "axi4lite_intf_driver.sv",
+    ]
+    tb_template = "tb_inst.sv"
+
+class FlatAXI4Lite(AXI4Lite):
+    cpuif_cls = AXI4Lite_Cpuif_flattened
+    rtl_files = []