x86, arm: Add missing license tag to syscall tables files

x86, arm: Add missing license tag to syscall tables files

syscall*.tbl files were added to make it easier to check which system
calls are supported on each architecture and to check for their numbers.

Arm and x86 files lack Linux-syscall-note license exception present in
files for all other architectures.

Signed-off-by: Marcin Juszkiewicz <[email protected]>
Signed-off-by: Borislav Petkov (AMD) <[email protected]>
Cc: [email protected]
Link: https://lore.kernel.org/r/[email protected]