BACKPORT: arch: add pidfd and io_uring syscalls everywhere

Add the io_uring and pidfd_send_signal system calls to all architectures.

These system calls are designed to handle both native and compat tasks,
so all entries are the same across architectures, only arm-compat and
the generic tale still use an old format.

Acked-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc)
Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com> (s390)
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

(cherry picked from commit 39036cd2727395c3369b1051005da74059a85317)

Conflicts:

        arch/alpha/kernel/syscalls/syscall.tbl
        arch/arm/tools/syscall.tbl
        arch/arm64/include/asm/unistd.h
        arch/arm64/include/asm/unistd32.h
        arch/ia64/kernel/syscalls/syscall.tbl
        arch/m68k/kernel/syscalls/syscall.tbl
        arch/microblaze/kernel/syscalls/syscall.tbl
        arch/mips/kernel/syscalls/syscall_n32.tbl
        arch/mips/kernel/syscalls/syscall_n64.tbl
        arch/mips/kernel/syscalls/syscall_o32.tbl
        arch/parisc/kernel/syscalls/syscall.tbl
        arch/powerpc/kernel/syscalls/syscall.tbl
        arch/s390/kernel/syscalls/syscall.tbl
        arch/sh/kernel/syscalls/syscall.tbl
        arch/sparc/kernel/syscalls/syscall.tbl
        arch/xtensa/kernel/syscalls/syscall.tbl
        arch/arm/include/uapi/asm/unistd.h
        arch/arm/kernel/calls.S

(1. Skipped syscall.tbl modifications for missing architectures.
 2. Skipped io_uring syscall additions
 3. Added __NR_pidfd_send_signal into arch/arm/include/uapi/asm/unistd.h
 4. Added CALL(sys_pidfd_send_signal) into arch/arm/kernel/calls.S)

Bug: 135608568
Test: make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf-
Change-Id: Ica9acfaee5602f26e8b1cea431b6fe6d53bf9cf9
Signed-off-by: Suren Baghdasaryan <surenb@google.com>