Revert "clang: enable support for BPF target"
Revert "clang: enable support for BPF target"

This reverts commit c888d0084072da5f5881ca14e1a4ef5f57e4dcca,
since the changes have now been appliend to upstream
meta-clang:
  https://github.com/kraj/meta-clang/commit/63cdfebb47be639e3aff22f3592c238f3c3b495c

Signed-off-by: Daniel Díaz <81c1e6f46dfb75ebff90afb11720614d43e597b3@linaro.org>

96boards/meta-rpb,96boards/meta-rpb