vts_fs_test: Require EROFS sysfs nodes.

These were backported to android13-5.10 and should be present in
T-launch kernels.

Bug: 233926292
Test: vts_fs_test
Change-Id: Ifb5ff6a200b081fe8696d5803d4a128740eb8e21
diff --git a/fs_mgr/tests/vts_fs_test.cpp b/fs_mgr/tests/vts_fs_test.cpp
index 8c49e4a..aac2cfd 100644
--- a/fs_mgr/tests/vts_fs_test.cpp
+++ b/fs_mgr/tests/vts_fs_test.cpp
@@ -47,6 +47,8 @@
     std::string fs;
     ASSERT_TRUE(android::base::ReadFileToString("/proc/filesystems", &fs));
     EXPECT_THAT(fs, ::testing::HasSubstr("\terofs\n"));
+
+    ASSERT_EQ(access("/sys/fs/erofs", F_OK), 0);
 }
 
 TEST(fs, PartitionTypes) {