Change static const to static constexpr am: 3a14cb49fa

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/3439181

Change-Id: I1df3c3cca7fde0a52926d1e1f77b81088d08cb4c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>