Enforce bpfmt -s in PREUPLOAD hook

Bug: 277168419
Test: None
Change-Id: Iba383125566786d04390b810f1bbe33425476b31

PREUPLOAD.cfg

@@ -15,6 +15,7 @@ rustfmt = --config-path=rustfmt.toml
 # Only turn on clang-format check for C and C++ headers and sources
 clang_format = --commit ${PREUPLOAD_COMMIT} --style file --extensions c,h,cc,cpp,hpp
 ktfmt = --kotlinlang-style
+bpfmt = -s
 
 [Hook Scripts]
 checkstyle_hook = ${REPO_ROOT}/prebuilts/checkstyle/checkstyle.py --sha ${PREUPLOAD_COMMIT}