Apicheck Support in Soong

didn't remove the props: api_filename, removed_api_filename yet since
these two currently are used by java_sdk_library.

Bug: b/78034256
Test: m clean && m checkapi

Change-Id: Iebd014ef227487717b5b3819c80d630c34559983

java/config/config.go

@@ -90,6 +90,7 @@ func init() {
 	pctx.HostBinToolVariable("MergeZipsCmd", "merge_zips")
 	pctx.HostBinToolVariable("Zip2ZipCmd", "zip2zip")
 	pctx.HostBinToolVariable("ZipSyncCmd", "zipsync")
+	pctx.HostBinToolVariable("ApiCheckCmd", "apicheck")
 	pctx.VariableFunc("DxCmd", func(ctx android.PackageVarContext) string {
 		config := ctx.Config()
 		if config.IsEnvFalse("USE_D8") {