KVM: VMX: Split out the non-virtualization part of vmx_interrupt_blocked()

Move the non-VMX chunk of the "interrupt blocked" checks to a separate
helper so that KVM can reuse the code to detect if interrupts are blocked
for L2, e.g. to determine if a virtual interrupt _for L2_ is a valid wake
event.  If L1 disables HLT-exiting for L2, nested APICv is enabled, and L2
HLTs, then L2 virtual interrupts are valid wake events, but if and only if
interrupts are unblocked for L2.

Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20240607172609.3205077-4-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

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