Initial ARC32 implementation

The includes and relevant (non wrapper) functions are borrowed from Zephyr 1.5.0

The implementation is still broken:
- an RTC driver is still missing, so no timed wakeup possible
- only the AON pins configured as LEVEL can wakeup the processor
  on Arduino101, the only AON broken out is RESET button
  Changing the main loop in CODK-A allows operating the button without triggering a reboot. However, the board doesn't wakeup from deep sleep (am I missing something maybe?)

Author: facchinm

src/ArduinoLowPower.h

@@ -7,6 +7,13 @@
 #error The library is not compatible with AVR boards
 #endif
 
+#ifdef ARDUINO_ARCH_ARC32
+#include "include/arc32/power_states.h"
+#include "include/arc32/ss_power_states.h"
+#include "include/arc32/qm_sensor_regs.h"
+#include "include/arc32/qm_soc_regs.h"
+#endif
+
 #ifdef ARDUINO_ARCH_SAMD
 #include "RTCZero.h"
 #endif
@@ -32,6 +39,23 @@ class ArduinoLowPowerClass {
 		RTCZero rtc;
 		#define RTC_ALARM_WAKEUP	0xFF
 		#endif
+
+		#ifdef ARDUINO_ARCH_ARC32
+		void ss_power_soc_lpss_enable();
+		void ss_power_soc_lpss_disable();
+		void ss_power_cpu_ss1(const ss_power_cpu_ss1_mode_t mode);
+		void ss_power_cpu_ss2();
+		void ss_power_soc_sleep_restore();
+		void ss_power_soc_deep_sleep_restore();
+		void ss_power_sleep_wait();
+		void power_soc_set_ss_restore_flag();
+		void power_soc_sleep();
+		void power_soc_deep_sleep();
+		void setAlarmIn(uint32_t millis);
+		#define RTC_ALARM_WAKEUP	0xFF
+		#define RESET_BUTTON_WAKEUP	0xFE
+		#endif
+
 };
 
 extern ArduinoLowPowerClass LowPower;