BoardConfig: Remove TARGET_HAVE_NEON flag (redundant)

This reverts commit 7957c43120a6549c76d93ab4f854461b1c749ca8.
BoardConfig: Switch back to original build optimization flags

Seemed to give best results and are tried and true

Change-Id: I4fd682b89956b187038f5d22c27c8cfa976dfd9b