Add arch for CMSIS-RTOS v1 and v2

src/util.c

@@ -109,6 +109,10 @@ uint64_t mg_millis(void) {
   return (uint64_t) Clock_getTicks();
 #elif MG_ARCH == MG_ARCH_ZEPHYR
   return (uint64_t) k_uptime_get();
+#elif MG_ARCH == MG_ARCH_CMSIS_RTOS1
+  return (uint64_t)rt_time_get();
+#elif MG_ARCH == MG_ARCH_CMSIS_RTOS2
+  return (uint64_t)((osKernelGetTickCount() * 1000) / osKernelGetTickFreq());
 #elif MG_ARCH == MG_ARCH_UNIX && defined(__APPLE__)
   // Apple CLOCK_MONOTONIC_RAW is equivalent to CLOCK_BOOTTIME on linux
   // Apple CLOCK_UPTIME_RAW is equivalent to CLOCK_MONOTONIC_RAW on linux