arm64: kuser32-bit helpers: do not include unistd32.h explicitly

arm64: kuser32-bit helpers: do not include unistd32.h explicitly

We get following warnings while building for arm64 arch:
----->8-----
In file included from arch/arm64/kernel/kuser32.S:32:0:
/linaro/android/kernel/pundir/arch/arm64/include/asm/unistd32.h:24:0: warning: "__NR_restart_syscall" redefined
 #define __NR_restart_syscall 0
 ^
In file included from include/asm-generic/unistd.h:1:0,
                 from /linaro/android/kernel/pundir/arch/arm64/include/uapi/asm/unistd.h:16,
                 from /linaro/android/kernel/pundir/arch/arm64/include/asm/unistd.h:50,
                 from arch/arm64/kernel/kuser32.S:31:
include/uapi/asm-generic/unistd.h:390:0: note: this is the location of the previous definition
 #define __NR_restart_syscall 128
 ^
In file included from arch/arm64/kernel/kuser32.S:32:0:
/linaro/android/kernel/pundir/arch/arm64/include/asm/unistd32.h:26:0: warning: "__NR_exit" redefined
 #define __NR_exit 1
 ^
In file included from include/asm-generic/unistd.h:1:0,
                 from /linaro/android/kernel/pundir/arch/arm64/include/uapi/asm/unistd.h:16,
                 from /linaro/android/kernel/pundir/arch/arm64/include/asm/unistd.h:50,
                 from arch/arm64/kernel/kuser32.S:31:
include/uapi/asm-generic/unistd.h:292:0: note: this is the location of the previous definition
 #define __NR_exit 93
 ^
-----8<-----

This patch removes unitstd32.h include to avoid duplication of
"__NR_" syscall definitions.

This patch is based on AOSP commit: cfc7e99e9e3900056028a7d90072e9ea0d886f8d,
"arm64: Add __NR_* definitions for compat syscalls", which adds
__NR_* definitions to asm/unistd32.h, moves the __NR_compat_*
definitions to asm/unistd.h and removes all the explicit unistd32.h
includes apart from the one building the compat syscall table.
The aim is to have the compat __NR_* definitions available but
without colliding with the native syscall definitions (required
by lib/compat_audit.c to avoid duplicating the audit header files
between native and compat).

Signed-off-by: Amit Pundir <amit.pundir@linaro.org>
Signed-off-by: Jon Medhurst <tixy@linaro.org>