Remove SKNX_NO_SIMD from public.bzl iOS build.
Remove SKNX_NO_SIMD from public.bzl iOS build.

This was added with d2ccc772d "Changes to public.bzl to support building
on iOS with objc_library bazel target." [0]. A recent test showed
nothing that breaks by removing this define, so try removing it now.

[0] https://codereview.chromium.org/1639443002

Change-Id: I9938e6a66b29e18332d9e7c4f60e2f2b2a5355ff
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/496606
Commit-Queue: Ben Wagner <53965154ffeecc4a10886eab9259e95965f2979a@google.com>
Auto-Submit: Ben Wagner <53965154ffeecc4a10886eab9259e95965f2979a@google.com>
Reviewed-by: Herb Derby <9e12a3d2bbf73546e47cc9958f6ba8f3215b7eaf@google.com>
Commit-Queue: Herb Derby <9e12a3d2bbf73546e47cc9958f6ba8f3215b7eaf@google.com>

aosp-mirror/platform_external_skia,google/skia,google/skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,google/skia,aosp-mirror/platform_external_skia,google/skia,google/skia,google/skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,google/skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,google/skia,google/skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,google/skia