neon: add rule for mulhuw
neon: add rule for mulhuw

Distrotech/orc,mojaves/orc,jpakkane/orc,ahmedammar/platform_external_gst_liborc,ahmedammar/platform_external_gst_liborc,ijsf/OpenWebRTC-orc,okuoku/nmosh-orc,okuoku/nmosh-orc,MOXfiles/orc,okuoku/nmosh-orc,Distrotech/orc,jpakkane/orc,mojaves/orc,MOXfiles/orc,ijsf/OpenWebRTC-orc,jpakkane/orc,ijsf/OpenWebRTC-orc,mojaves/orc,Distrotech/orc,MOXfiles/orc