feat: refactor NMI interface and enhance performance logging

- Updated NMI interface references from  to  in multiple files for consistency.
- Added a new script  to convert UART performance records into structured JSON format.
- Enhanced the README documentation to include details about the new performance log parser.
- Implemented tests for the new performance log parser to ensure correct functionality.
- Added new test cases for DMA error handling and SDRAM data integrity to improve coverage.
- Updated existing test cases to accommodate changes in the NMI interface and added performance metrics.
- Refactored bus fault testbench to include fault code checks and improved error handling.
- Adjusted memory map generation and pin mapping tests to reflect recent changes in RTL structure.

configs/ci/ics55.mk

@@ -7,4 +7,4 @@ HAVE_SVA        := NO
 ISA             := RV32IM
 HAVE_CSR        := NO
 APP             := bringup
-LINK_TYPE       := ld2_psram
+LINK_TYPE       := ld2_psram