Revert "vfp: Change -mfpu=softvfp+vfp to neon"

This reverts commit a49b4c70e69600fc2d795facf0c01e41badd2d94.
Revert "Fix compile with toolchain"

This reverts commit aaf40e0121f5c300a087842d3575c40cc1f359c6.
Revert "Add some optimization flags"

This reverts commit 6cde8862bc3bba270c61a8d0756032ce895260f3.
Fix compile with toolchain
arm: Allow CPU-supported unaligned accesses