tricore: Add fpu init and fpucmp support.

[zyfeier]

Summary

• Why: TriCore TC4xx FPU needs initialization to enable flush-to-zero trap, and ostest requires up_fpucmp() for FPU context comparison.
• What: arch/tricore FPU initialization, trap reporting, and context comparison.
• How: Add tricore_fpuinit() to enable FZ trap via FPU_SYNC_TRAP_CON register, add up_fpucmp() to compare D8-D15 in the upper CSA context, add FPU trap reporting in trap handler, add iLLD patch for CoprocessorTrapSynchronousError enum.

Impact

• Is new feature added? YES - FPU initialization and fpucmp support for TriCore TC4xx.
• Impact on user (will user need to adapt to change)? NO
• Impact on build (will build process change)? NO
• Impact on hardware (will arch(s) / board(s) / driver(s) change)? YES - tricore arch only, enabled via ARCH_HAVE_FPU.
• Impact on documentation (is update required / provided)? NO
• Impact on security (any sort of implications)? NO
• Impact on compatibility (backward/forward/interoperability)? NO

Testing

I confirm that changes are verified on local setup and works as intended:

• Build Host(s): Linux x86_64, GCC 11.3.1 (tricore-elf-gcc)
• Target(s): tricore, triboard_tc4x9_com:nsh (CONFIG_ARCH_FPU=y)

Testing logs (runtime, ostest FPU on TC4D9 EVB):

  user_main: FPU test
  Starting task FPU#1
  fpu_test: Started task FPU#1 at PID=6
  FPU#1: pass 1
  Starting task FPU#2
  fpu_test: Started task FPU#2 at PID=7
  FPU#2: pass 1
  FPU#1: pass 2
  FPU#2: pass 2
  FPU#1: pass 3
  FPU#2: pass 3
  FPU#1: pass 4
  FPU#2: pass 4
  FPU#1: pass 5
  FPU#2: pass 5
  FPU#1: pass 6
  FPU#2: pass 6
  FPU#1: pass 7
  FPU#2: pass 7
  FPU#1: pass 8
  FPU#2: pass 8
  FPU#1: pass 9
  FPU#2: pass 9
  FPU#1: pass 10
  FPU#2: pass 10
  FPU#1: pass 11
  FPU#2: pass 11
  FPU#1: pass 12
  FPU#2: pass 12
  FPU#1: pass 13
  FPU#2: pass 13
  FPU#1: pass 14
  FPU#2: pass 14
  FPU#1: pass 15
  FPU#2: pass 15
  FPU#1: pass 16
  FPU#2: pass 16
  FPU#1: Succeeded
  FPU#2: Succeeded
  fpu_test: Returning