bpf: Remove duplicate crypto/sha2.h header

./include/linux/bpf.h: crypto/sha2.h is included more than once.

Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Closes: https://bugzilla.openanolis.cn/show_bug.cgi?id=25501


Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com>
Acked-by: Quentin Monnet <qmo@kernel.org>
Link: https://lore.kernel.org/r/20250926095240.3397539-1-jiapeng.chong@linux.alibaba.com


Signed-off-by: Alexei Starovoitov <ast@kernel.org>