KVM: SVM: Extract SVM specific code out of get_pi_vcpu_info()

Genericize SVM's get_pi_vcpu_info() so that it can be shared with VMX.
The only SVM specific information it provides is the AVIC back page, and
that can be trivially retrieved by its sole caller.

No functional change intended.

Cc: Francesco Lavra <francescolavra.fl@gmail.com>
Tested-by: Sairaj Kodilkar <sarunkod@amd.com>
Link: https://lore.kernel.org/r/20250611224604.313496-27-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

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