Remap loads to //fbpkg:fbpkg.bzl

Summary:
Completes ongoing codemod of `//antlir/fbpkg:fbpkg.bzl` to `//fbpkg:fbpkg.bzl` by replacing the load for all remaining projects in fbsource.

**This is a no-op and is not intended to have any effect** - the load is simply no longer a part of antlir and has moved to the fbpkg directory directly.

Reviewed By: naveedgol

Differential Revision: D62459604

fbshipit-source-id: b247872027930861dcf7ac95e6ac21cd8213e196

folly/debugging/symbolizer/tool/BUCK

@@ -1,4 +1,4 @@
-load("@fbcode//antlir/fbpkg:fbpkg.bzl", "fbpkg")
+load("@fbcode//fbpkg:fbpkg.bzl", "fbpkg")
 load("@fbcode_macros//build_defs:cpp_binary.bzl", "cpp_binary")
 load("@fbcode_macros//build_defs:export_files.bzl", "export_file")