boot: implement ShowSplashScreen/Display

stratosphere/boot/source/boot_spl_utils.cpp

@@ -30,4 +30,18 @@ bool Boot::IsRecoveryBoot() {
         std::abort();
     }
     return val != 0;
+}
+
+bool Boot::IsMariko() {
+    HardwareType hw_type = GetHardwareType();
+    switch (hw_type) {
+        case HardwareType_Icosa:
+        case HardwareType_Copper:
+            return false;
+        case HardwareType_Hoag:
+        case HardwareType_Iowa:
+            return true;
+        default:
+            std::abort();
+    }
 }