asm-generic: add generic seccomp.h for secure computing mode 1

Those values (__NR_seccomp_*) are used solely in secure_computing()
to identify mode 1 system calls. If compat system calls have different
syscall numbers, asm/seccomp.h may override them.

Acked-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Git-commit: 65a2ae8d5bd0ab9fb5846c0223d5dcf74e87f9d2
Git-repo: https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git


Change-Id: Ic3c93778cb7b97f82716dfea6b9e73f56863f407
Signed-off-by: Ravi Kumar Siddojigari <rsiddoji@codeaurora.org>
Signed-off-by: Nirmal Abraham <nabrah@codeaurora.org>