vts: kernel: Fix loop device configuration test am: 8e442e0fb8

Original change: https://android-review.googlesource.com/c/platform/test/vts-testcase/kernel/+/2498377

Change-Id: I9e462540bb23f2f947404e9ea54a93d1c82fed23
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>