UefiCpuPkg: CpuTimerDxeRiscV64: Fix incorrect value sent to SbiSetTimer

SbiSetTimer expects core tick value.

Cc: Andrei Warkentin <andrei.warkentin@intel.com>
Signed-off-by: Tuan Phan <tphan@ventanamicro.com>
Reviewed-by: Sunil V L <sunilvl@ventanamicro.com>

UefiCpuPkg/CpuTimerDxeRiscV64/Timer.h

@@ -21,7 +21,7 @@
 #include <Library/IoLib.h>
 
 //
-// RISC-V use 100us timer.
+// RISC-V use 100ns timer.
 // The default timer tick duration is set to 10 ms = 10 * 1000 * 10 100 ns units
 //
 #define DEFAULT_TIMER_TICK_DURATION  100000