KVM: selftests: Put command line options in alphabetical order in dirty_log_perf_test

KVM: selftests: Put command line options in alphabetical order in dirty_log_perf_test

There are 13 command line options and they are not in any order. Put
them in alphabetical order to make it easy to add new options.

No functional change intended.

Signed-off-by: Vipin Sharma <vipinsh@google.com>
Reviewed-by: Wei Wang <wei.w.wang@intel.com>
Reviewed-by: Sean Christopherson <seanjc@google.com>
Link: https://lore.kernel.org/r/20221103191719.1559407-3-vipinsh@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>