bpf: crypto: fix build when CONFIG_CRYPTO=m

bpf: crypto: fix build when CONFIG_CRYPTO=m

Crypto subsytem can be build as a module. In this case we still have to
build BPF crypto framework otherwise the build will fail.

Fixes: 3e1c6f35409f ("bpf: make common crypto API for TC/XDP programs")
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202405011634.4JK40epY-lkp@intel.com/
Signed-off-by: Vadim Fedorenko <vadfed@meta.com>
Link: https://lore.kernel.org/r/20240501170130.1682309-1-vadfed@meta.com
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>