feat: add NPU register tests for RTL and SDK synchronization

- Introduced  to ensure consistency between RTL and C register definitions.
- Implemented exhaustive checks for offsets, scalar encodings, bit shifts, and enumerations.
- Added  for shell and control-CDC unit tests using Icarus and Verilator.
- Created test cases for NPU register and control CDC functionality, verifying successful simulation outputs.

scripts/run_c_tests.py

@@ -36,6 +36,7 @@ TEST_SOURCES = (
     "crt/src/hal/apu.c",
     "crt/src/hal/ga2d_math.c",
     "crt/src/hal/ga2d.c",
+    "crt/src/hal/npu.c",
     "crt/src/hal/fabric_monitor.c",
     "crt/src/hal/sysctrl.c",
     "crt/src/hal/clock.c",
@@ -99,6 +100,7 @@ def main() -> int:
             "-fno-builtin",
             "-DRS_APU_TEST_MMIO",
             "-DRS_GA2D_TEST_MMIO",
+            "-DRS_NPU_TEST_MMIO",
             "-DRS_FABRIC_MONITOR_TEST_MMIO",
             "-DRS_RESOURCE_TEST_MMIO",
             "-I",