alpha: generate uapi header and syscall table header files

System call table generation script must be run to gener-
ate unistd_32.h and syscall_table.h files. This patch will
have changes which will invokes the script.

This patch will generate unistd_32.h and syscall_table.h
files by the syscall table generation script invoked by
alpha/Makefile and the generated files against the removed
files must be identical.

The generated uapi header file will be included in uapi/-
asm/unistd.h and generated system call table header file
will be included by kernel/systbls.S file.
Signed-off-by: Firoz Khan <firoz.khan@linaro.org>
Signed-off-by: Matt Turner <mattst88@gmail.com>

arch/alpha/Makefile

@@ -61,6 +61,9 @@ bootimage bootpfile bootpzfile: vmlinux
 archclean:
 	$(Q)$(MAKE) $(clean)=$(boot)
 
+archheaders:
+	$(Q)$(MAKE) $(build)=arch/alpha/kernel/syscalls all
+
 define archhelp
   echo '* boot		- Compressed kernel image (arch/alpha/boot/vmlinux.gz)'
   echo '  bootimage	- SRM bootable image (arch/alpha/boot/bootimage)'

arch/alpha/include/asm/Kbuild

 # SPDX-License-Identifier: GPL-2.0
 
-
+generated-y += syscall_table.h
 generic-y += compat.h
 generic-y += exec.h
 generic-y += export.h

arch/alpha/include/uapi/asm/Kbuild

 # UAPI Header export list
 include include/uapi/asm-generic/Kbuild.asm
 
+generated-y += unistd_32.h
 generic-y += bpf_perf_event.h
 generic-y += ipcbuf.h
 generic-y += msgbuf.h