Init rtc and pic in kernel

sw/kernel/devices/rtc.h

@@ -0,0 +1,16 @@
+#ifndef _RTC_H
+#define _RTC_H
+
+#include <stdint.h>
+
+#define RTC_CMD_ADDR    0xeffe
+#define RTC_DAT_ADDR    0xefff
+
+/* initialize RTC with default values */
+void init_rtc(void);
+
+/* handle RTC interrupts */
+void handle_rtc(void);
+
+
+#endif