generic syscalls: wire up preadv2 and pwritev2 syscalls

These new syscalls are implemented as generic code, so enable them for
architectures like arm64 which use the generic syscall table.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

path: root/generate_text.pl

#!/usr/bin/perl

$lines = $ARGV[0];
$chars = $ARGV[1];

die unless $lines;
die unless $chars;

while ($lines--) {
	print int(rand(9)) x $chars;
	print "\n";
}