OpenBLAS

Remove SVE from Arm(R) Neoverse(TM) N1 CPU in Makefile

I incorrectly added `+sve` to the Neoverse(TM) N1 CPUs GCC parameters,
which doesn't support SVE - this results in failed builds when using a
compiler that doesn't support `-mtune=neoverse-n1` which appears to hide
the mistake.