target: msm8974: Fix return type for target mmc device

Change-Id: I1a1d5cb7df1fee7f0da616b8b27e3a8f78aac769
diff --git a/target/msm8974/init.c b/target/msm8974/init.c
index 69edb17..d544424 100644
--- a/target/msm8974/init.c
+++ b/target/msm8974/init.c
@@ -248,9 +248,9 @@
 	}
 }
 
-struct mmc_device *target_mmc_device()
+void *target_mmc_device()
 {
-	return dev;
+	return (void *) dev;
 }
 
 #else