commonsys-intf: display: Add SmoMo mode interface

Add interfaces which allow users to get and set SmoMo
mode.

Change-Id: I2e0adb367cf17421dd69bf4cbcaa568dc3d3f1fb

include/smomo_config.h

@@ -32,10 +32,16 @@
 #ifndef __SMOMO_CONFIG_H__
 #define __SMOMO_CONFIG_H__
 
+#include <cstdint>
+
 namespace smomoconfig {
 
 int EnableSmomo(bool enable);
 
+int GetSmomoMode(uint32_t *mode_idx);
+
+int SetSmomoMode(uint32_t mode_idx);
+
 }  // namespace smomoconfig
 
 #endif  // __SMOMO_CONFIG_H__