Don't depend on String8 cast to C string am: 8acdce346b

Original change: https://android-review.googlesource.com/c/platform/hardware/google/graphics/gs101/+/2749177

Change-Id: Ib75335f44d0353ca9a6ee2ae45a637cd78f0b0ec
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>