KVM: selftests: Shorten the test args in memslot_modification_stress_test.c

Change test args memslot_modification_delay and nr_memslot_modifications
to delay and nr_iterations for simplicity.

Signed-off-by: Vipin Sharma <vipinsh@google.com>
Suggested-by: Sean Christopherson <seanjc@google.com>
Reviewed-by: Sean Christopherson <seanjc@google.com>
Link: https://lore.kernel.org/r/20221103191719.1559407-6-vipinsh@google.com


Signed-off-by: Sean Christopherson <seanjc@google.com>