Enable access to kernel tick information in ISR

The osKernelGetTickCount() is the only function to get kernel tick information,
however it's not allowed to access in ISR.

It's already enabled in API v2.1.1.

Author: v2422

rtos/TARGET_CORTEX/rtx5/rtx_kernel.c

@@ -607,8 +607,7 @@ void osKernelResume (uint32_t sleep_ticks) {
 /// Get the RTOS kernel tick count.
 uint64_t osKernelGetTickCount (void) {
   if (IS_IRQ_MODE() || IS_IRQ_MASKED()) {
-    EvrRtxKernelGetTickCount(0U);
-    return  0U;
+    return svcRtxKernelGetTickCount();
   } else {
     return  __svcKernelGetTickCount();
   }
@@ -617,8 +616,7 @@ uint64_t osKernelGetTickCount (void) {
 /// Get the RTOS kernel tick frequency.
 uint32_t osKernelGetTickFreq (void) {
   if (IS_IRQ_MODE() || IS_IRQ_MASKED()) {
-    EvrRtxKernelGetTickFreq(0U);
-    return  0U;
+    return svcRtxKernelGetTickFreq();
   } else {
     return  __svcKernelGetTickFreq();
   }