tools include UAPI powerpc: Sync errno.h with the kernel headers

To pick the change in:

7de21e679e6a789f ("powerpc: fix EDEADLOCK redefinition error in uapi/asm/errno.h")

That will make the errno number -> string tables to pick this change on powerpc.

Silencing this perf build warning:

Warning: Kernel ABI header at 'tools/arch/powerpc/include/uapi/asm/errno.h' differs from latest version at 'arch/powerpc/include/uapi/asm/errno.h'
diff -u tools/arch/powerpc/include/uapi/asm/errno.h arch/powerpc/include/uapi/asm/errno.h

Cc: Michael Ellerman <[e-mail]>
Cc: Tony Ambardar <[e-mail]>
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

tools/arch/powerpc/include/uapi/asm/errno.h

···
 #ifndef _ASM_POWERPC_ERRNO_H
 #define _ASM_POWERPC_ERRNO_H
 
+#undef	EDEADLOCK
 #include <asm-generic/errno.h>
 
 #undef	EDEADLOCK