Use the new incfs API to open files

Bug: 152983639
Test: atest service.incremental_test
Change-Id: If33891d4699d5ddf2789ac99677a67e2b004d94e
diff --git a/services/incremental/IncrementalService.cpp b/services/incremental/IncrementalService.cpp
index 25da8fe..cae411b 100644
--- a/services/incremental/IncrementalService.cpp
+++ b/services/incremental/IncrementalService.cpp
@@ -1182,8 +1182,8 @@
             success = false;
             break;
         }
-        android::base::unique_fd writeFd(mIncFs->openWrite(ifs->control, libFileId));
-        if (writeFd < 0) {
+        const auto writeFd = mIncFs->openForSpecialOps(ifs->control, libFileId);
+        if (!writeFd.ok()) {
             LOG(ERROR) << "Failed to open write fd for: " << targetLibPath << " errno: " << writeFd;
             success = false;
             break;