Move x86 and x86_64 libc to use libcrt

With __cpu_model visibility issue fixed in libcrt, we can move x86 and
x86_64 libc to use libcrt as well.

Test: emulator boots
Bug: 122993569
Change-Id: If71c324180010a57e3e9598d758a4d6ab1a3c369
diff --git a/libc/Android.bp b/libc/Android.bp
index a27b1ce..182e8f7 100644
--- a/libc/Android.bp
+++ b/libc/Android.bp
@@ -77,14 +77,6 @@
     native_coverage: false,
     recovery_available: true,
 
-    arch: {
-        x86: {
-            no_libcrt: true,
-        },
-        x86_64: {
-            no_libcrt: true,
-        },
-    },
     // lld complains about duplicate symbols in libcrt and libgcc. Suppress the
     // warning since this is intended right now.
     ldflags: ["-Wl,-z,muldefs"],