Move linker from sampling PGO to AFDO pipeline

Sampling PGO is being replaced by AFDO.

Test: presubmit
Change-Id: I23e4dace5f2c2d1f2499daba99a28b2a1bc0f22d
diff --git a/linker/Android.bp b/linker/Android.bp
index 3ceafc7..dbefcf6 100644
--- a/linker/Android.bp
+++ b/linker/Android.bp
@@ -369,31 +369,9 @@
                 "liblinker_debuggerd_stub",
             ],
         },
-        android_arm64: {
-            pgo: {
-                profile_file: "bionic/linker_arm_arm64.profdata",
-            },
-        },
-        android_arm: {
-            pgo: {
-                profile_file: "bionic/linker_arm_arm64.profdata",
-            },
-        },
-        android_x86_64: {
-            pgo: {
-                profile_file: "bionic/linker_x86_x86_64.profdata",
-            },
-        },
-        android_x86: {
-            pgo: {
-                profile_file: "bionic/linker_x86_x86_64.profdata",
-            },
-        },
     },
 
-    pgo: {
-        sampling: true,
-    },
+    afdo: true,
 }
 
 // ========================================================