ANDROID: kleaf: make pahole publicly visible

This will allow mixed builds to use source-built pahole.

Bug: 477549297
Change-Id: Ibc9293bef1fa9ce4ebeb8c0ba1126e9ce0ec0713
Signed-off-by: Siddharth Nayyar <sidnayyar@google.com>

BUILD.bazel

@@ -1304,7 +1304,7 @@ cc_library(
 
 pahole(
     name = "pahole",
-    visibility = ["//visibility:private"],
+    visibility = ["//visibility:public"],
     deps = [":bpf_x86"],
 )