refactor: refactor tests to replace RIBP references with APB4 equivalents

- Updated test files to change instances of ribp_if to apb4_if in various test cases, ensuring consistency with the new APB4 interface.
- Modified assertions and checks in tests to reflect the new APB4 naming conventions, including changes in expected output and input files.
- Adjusted the test descriptions to accurately represent the APB4 functionality being tested, particularly in timer, UART, and GPIO tests.
- Ensured that all relevant paths and file names in the tests are updated to point to the new APB4 implementations, maintaining the integrity of the test suite.

tests/test_dvp.py

@@ -1,4 +1,4 @@
-"""RIBP DVP register, CDC, framing, and packing regression."""
+"""APB4 DVP register, CDC, framing, and packing regression."""
 
 from __future__ import annotations
 
@@ -29,7 +29,7 @@ def test_dvp_capture_framing(tmp_path: Path) -> None:
         "+incdir+" + str(common / "cdc"),
         "+incdir+" + str(common / "clkrst"),
         "+incdir+" + str(ip),
-        str(common / "interface/ribp_if.sv"),
+        str(common / "interface/apb4_if.sv"),
         str(common / "interface/axi4_stream_if.sv"),
         str(common / "utils/register.sv"),
         str(common / "utils/xchecker.sv"),
@@ -60,4 +60,4 @@ def test_dvp_capture_framing(tmp_path: Path) -> None:
     simulation = tmp_path / "dvp_tb"
     subprocess.run([iverilog, "-g2012", "-s", "dvp_tb", "-o", str(simulation), str(converted)], check=True)
     result = subprocess.run([vvp, str(simulation)], check=True, capture_output=True, text=True)
-    assert "RIBP DVP capture test passed" in result.stdout
+    assert "APB4 DVP capture test passed" in result.stdout