Revert "Update min_sdk_version from SdkSpec to ApiLevel"

Revert submission 2457063

Reason for revert: Broken udc-dev

Reverted changes: /q/submissionid:2457063

Change-Id: Id6349fc1318877044af713c914a0afd437d3d2d5
diff --git a/java/dex.go b/java/dex.go
index 4d6aa34..7b6a99a 100644
--- a/java/dex.go
+++ b/java/dex.go
@@ -343,7 +343,7 @@
 type compileDexParams struct {
 	flags         javaBuilderFlags
 	sdkVersion    android.SdkSpec
-	minSdkVersion android.ApiLevel
+	minSdkVersion android.SdkSpec
 	classesJar    android.Path
 	jarName       string
 }