KVM: arm64: Drop perf.c and fold its tiny bits of code into arm.c

Call KVM's (un)register perf callbacks helpers directly from arm.c and
delete perf.c

No functional change intended.

Signed-off-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20211111020738.2512932-17-seanjc@google.com