Remove APPLETVOS variants from targets.

Summary:
After D37553813, there are no more TV apps in `fbsource`. Thus, we can begin the sequential teardown of all of the `APPLETVOS` variants in the codebase, which should migrating to `select()` and buck parse times a bit faster.

#nocancel

Reviewed By: natestedman

Differential Revision: D37594789

fbshipit-source-id: 830e40266654f948f39f5d10c32a080e970cf9d7

BUCK

@@ -10,7 +10,6 @@ load(
 )
 load(
     "//tools/build_defs/oss:rn_defs.bzl",
-    "APPLETVOS",
     "HERMES_BYTECODE_VERSION",
     "IOS",
     "RCT_IMAGE_DATA_DECODER_SOCKET",
@@ -189,7 +188,7 @@ rn_xplat_cxx_library2(
         exclude = RCTCXXMODULE_PUBLIC_HEADERS.values(),
         prefix = "React",
     ),
-    apple_sdks = (IOS, APPLETVOS),
+    apple_sdks = (IOS,),
     contacts = ["oncall+react_native@xmail.facebook.com"],
     fbobjc_enable_exceptions = True,
     frameworks = [