risc-v support all irq handler

board/Sipeed_LonganNano/BSP/Src/gd32vf103_it.c

@@ -0,0 +1,9 @@
+#include "tos.h"
+void SysTick_IRQHandler() {
+    port_systick_config((uint32_t)k_cpu_cycle_per_tick);
+    if (tos_knl_is_running()) {
+        tos_knl_irq_enter();
+        tos_tick_handler();
+        tos_knl_irq_leave();
+    }
+}