drop sse4.1 limit on valgrind bots

I think we may not need this limit since 3.15.0 added f16c support.

Cq-Include-Trybots: skia.primary:Test-Ubuntu18-GCC-Golo-GPU-QuadroP400-x86_64-Release-All-Valgrind_PreAbandonGpuContext,Perf-Ubuntu18-GCC-Golo-GPU-QuadroP400-x86_64-Release-All-Valgrind,Test-Ubuntu18-GCC-Golo-GPU-QuadroP400-x86_64-Release-All-Valgrind,Test-Ubuntu18-GCC-Golo-GPU-QuadroP400-x86_64-Release-All-Valgrind_AbandonGpuContext
Change-Id: I4de547069ca0c77f2208c86f995496880df75d36
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/255342
Commit-Queue: Mike Klein <mtklein@google.com>
Reviewed-by: Ben Wagner aka dogben <benjaminwagner@google.com>
9 files changed