Merge "Update external/libyuv to r1837" am: fefd4478ef am: 521d439731 am: 9ceba339ff am: b2a62fd681

Original change: https://android-review.googlesource.com/c/platform/external/libyuv/+/2196947

Change-Id: I835b85bea55524d5186ecf2d74befccaec0a17c3
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>