[release/6.0] Add osx-arm64.runtime.native.System.IO.Ports (#60084)

* Add runtime.osx-arm64.runtime.native.System.IO.Ports proj file for packaging.
Tested on actual osx-arm64 hardware, resulting package works correctly.

* Update src/libraries/System.IO.Ports/pkg/runtime.osx-arm64.runtime.native.System.IO.Ports.proj

Co-authored-by: Viktor Hofer <viktor.hofer@microsoft.com>

Co-authored-by: Viktor Hofer <viktor.hofer@microsoft.com>

Author: SeanMollet

src/libraries/System.IO.Ports/pkg/runtime.osx-arm64.runtime.native.System.IO.Ports.proj

@@ -0,0 +1,7 @@
+<Project>
+  <Import Project="runtime.native.System.IO.Ports.props" />
+  <PropertyGroup>
+    <!-- TODO: Remove when the package shipped. -->
+    <DisablePackageBaselineValidation>true</DisablePackageBaselineValidation>
+  </PropertyGroup>
+</Project>