bpf, x86: Fix objtool warning for timed may_goto

bpf, x86: Fix objtool warning for timed may_goto

Kernel test robot reported "call without frame pointer save/setup"
warning in objtool. This will make stack traces unreliable on
CONFIG_UNWINDER_FRAME_POINTER=y, however it works on
CONFIG_UNWINDER_ORC=y. Fix this by creating a stack frame for the
function.

Fixes: 2fb761823ead ("bpf, x86: Add x86 JIT support for timed may_goto")
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202503071350.QOhsHVaW-lkp@intel.com/
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Link: https://lore.kernel.org/r/20250315013039.1625048-1-memxor@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>