KVM: selftests: Spell out UCALL in nested TSC scaling test's enums

Explicitly spell out UCALL instead of prefixing only U in the nested TSC
scaling test's ucall commands, as it's all too easy to think USLEEP means
"do usleep()", when it actually means "do sleep() in userspace".

Opportunistically name the enum and take an enum instead of a bare integer
for the to-be-checked level, to make it more obvious that the fact that
the level values happen to correspond to '1' and '2' for the nesting level
is largely coincidental (or perhaps it was intentional, but it's not a hard
requirement for the test).

Link: https://patch.msgid.link/20260930173635.3362655-22-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

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