Create arch_init function, enable interrupts

src/arch/8051/include/arch/arch.h

@@ -0,0 +1,6 @@
+#ifndef _ARCH_ARCH_H
+#define _ARCH_ARCH_H
+
+void arch_init(void);
+
+#endif // _ARCH_ARCH_H

src/arch/8051/include/arch/time.h

@@ -1,6 +1,8 @@
 #ifndef _ARCH_TIME_H
 #define _ARCH_TIME_H
 
+#include <stdint.h>
+
 void time_init(void);
 uint32_t time_get(void);