UefiCpuPkg/CpuDxeRiscV64: Use DT based timer frequency for CPU driver

There is GetPerformanceCounterProperties() that relies
on Device Tree to fetch timer frequency and removes the
dependency from the PCDs, use that instead.

Signed-off-by: Akshay Behl <cap2k4@rivosinc.com>

Co-authored-by: Dhaval Sharma <dhaval@rivosinc.com>

UefiCpuPkg/CpuDxeRiscV64/CpuDxe.c

@@ -269,7 +269,7 @@ CpuGetTimerValue (
   if (TimerPeriod != NULL) {
     *TimerPeriod = DivU64x32 (
                      1000000000000000u,
-                     PcdGet64 (PcdCpuCoreCrystalClockFrequency)
+                     GetPerformanceCounterProperties (NULL, NULL)
                      );
   }
 

UefiCpuPkg/CpuDxeRiscV64/CpuDxe.h

@@ -17,6 +17,7 @@
 #include <Library/BaseRiscVFpuLib.h>
 #include <Library/BaseRiscVSbiLib.h>
 #include <Library/BaseRiscVMmuLib.h>
+#include <Library/TimerLib.h>
 #include <Library/BaseLib.h>
 #include <Library/CacheMaintenanceLib.h>
 #include <Library/CpuExceptionHandlerLib.h>

UefiCpuPkg/CpuDxeRiscV64/CpuDxeRiscV64.inf

@@ -40,6 +40,7 @@
   RiscVMmuLib
   RiscVFpuLib
   CacheMaintenanceLib
+  TimerLib
 
 [Sources]
   CpuDxe.c
@@ -62,7 +63,6 @@
   gEfiMdeModulePkgTokenSpaceGuid.PcdNullPointerDetectionPropertyMask    ## CONSUMES
   gUefiCpuPkgTokenSpaceGuid.PcdCpuStackSwitchExceptionList              ## CONSUMES
   gUefiCpuPkgTokenSpaceGuid.PcdCpuKnownGoodStackSize                    ## CONSUMES
-  gUefiCpuPkgTokenSpaceGuid.PcdCpuCoreCrystalClockFrequency             ## CONSUMES
 
 [Depex]
   TRUE