Include Reactor/CPUID.cpp in Android x86 build

This is required for Cuttlefish to compile Swiftshader

Change-Id: If34d250ad9556ea753c706c739c2aed277fbaaab
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/34948
Tested-by: Chris Forbes <chrisforbes@google.com>
Presubmit-Ready: Chris Forbes <chrisforbes@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Reviewed-by: Ben Clayton <bclayton@google.com>
diff --git a/src/Android.bp b/src/Android.bp
index 8f709bc..0d6f584 100644
--- a/src/Android.bp
+++ b/src/Android.bp
@@ -196,6 +196,7 @@
         "Reactor/Reactor.cpp",
         "Reactor/LLVMReactor.cpp",
         "Reactor/Debug.cpp",
+        "Reactor/CPUID.cpp",
     ],
 
     cflags: [