Bug 1679356 - P1. Make the VP9 HW decoder work on Apple Silicon. r=haik

We relax the sandbox to allow querying the IOAVDHEVCDecodeCapabilities property

Differential Revision: https://phabricator.services.mozilla.com/D97983

security/sandbox/mac/SandboxPolicyRDD.h

@@ -163,6 +163,7 @@ static const char SandboxPolicyRDD[] = R"SANDBOX_LITERAL(
       (iokit-property "IOGLBundleName")
       (iokit-property "IOGVACodec")
       (iokit-property "IOGVAHEVCDecode")
+      (iokit-property "IOAVDHEVCDecodeCapabilities")
       (iokit-property "IOGVAHEVCEncode")
       (iokit-property "IOGVAXDecode")
       (iokit-property "IOPCITunnelled")