Remove useless `neon:` clause. am: 62a3b8ca4a am: e573552c6d

Original change: https://android-review.googlesource.com/c/platform/external/libmpeg2/+/3010320

Change-Id: I1ec07d765006d627c2e5d7427fb80570fa68da74
Signed-off-by: Automerger Merge Worker <[email protected]>