Sophgo/SG2042Pkg: Update SG2042.dsc

1. Correct the path of CpuExceptionHandlerLib
2. Remove unnecessary RiscVFpuLib

Signed-off-by: Xiang W <wangxiang@iscas.ac.cn>

Author: wxjstz

Platform/Sophgo/SG2042_EVB_Board/SG2042.dsc

@@ -144,9 +144,8 @@
 
   # RISC-V Architectural Libraries
   RiscVSbiLib|MdePkg/Library/BaseRiscVSbiLib/BaseRiscVSbiLib.inf
-  RiscVFpuLib|UefiCpuPkg/Library/BaseRiscVFpuLib/BaseRiscVFpuLib.inf
   RiscVMmuLib|UefiCpuPkg/Library/BaseRiscVMmuLib/BaseRiscVMmuLib.inf
-  CpuExceptionHandlerLib|UefiCpuPkg/Library/BaseRiscV64CpuExceptionHandlerLib/BaseRiscV64CpuExceptionHandlerLib.inf
+  CpuExceptionHandlerLib|UefiCpuPkg/Library/CpuExceptionHandlerLib/DxeCpuExceptionHandlerLib.inf
 
   TimerLib|UefiCpuPkg/Library/BaseRiscV64CpuTimerLib/BaseRiscV64CpuTimerLib.inf
   TimeBaseLib|EmbeddedPkg/Library/TimeBaseLib/TimeBaseLib.inf
@@ -161,6 +160,7 @@
 !else
   DebugLib|MdePkg/Library/BaseDebugLibNull/BaseDebugLibNull.inf
 !endif
+  CpuExceptionHandlerLib|UefiCpuPkg/Library/CpuExceptionHandlerLib/SecPeiCpuExceptionHandlerLib.inf
 
   ReportStatusCodeLib|MdeModulePkg/Library/PeiReportStatusCodeLib/PeiReportStatusCodeLib.inf
   ExtractGuidedSectionLib|MdePkg/Library/BaseExtractGuidedSectionLib/BaseExtractGuidedSectionLib.inf