Restore compiler flag to neon-vfpv4

Revert "Restore compiler flags, change fpu to neon"

This reverts commit b5f0f3aba9b6823f9e00bca3b919eb465dcac903.

Revert "Remove unsupported compiler flags"

This reverts commit 88811218c1d22fe526f6a66de71d91d7a9af6a53.

Change-Id: I1eba2f6d3ded06cc33ed689d5206f973431d4db4