Convert more versions in config to ApiLevel.

The test case I removed is invalid. The codename has had its int
assigned, but the config claims it is not final.

If this ever does need to be supported it's just a matter of making
sure the Q -> 29 mapping (or whatever) in the finalized codenames map
in android/api_levels.go.

Test: treehugger
Bug: http://b/154667674
Change-Id: I4f42ec2fd4a37750519ee3937938a1c65b6bb1e8

java/app.go

@@ -157,7 +157,7 @@ func (as *AndroidAppSet) GenerateAndroidBuildActions(ctx android.ModuleContext)
 				"abis":              strings.Join(SupportedAbis(ctx), ","),
 				"allow-prereleased": strconv.FormatBool(proptools.Bool(as.properties.Prerelease)),
 				"screen-densities":  screenDensities,
-				"sdk-version":       ctx.Config().PlatformSdkVersion(),
+				"sdk-version":       ctx.Config().PlatformSdkVersion().String(),
 				"stem":              as.BaseModuleName(),
 				"apkcerts":          as.apkcertsFile.String(),
 				"partition":         as.PartitionTag(ctx.DeviceConfig()),