KVM: arm64: Drop check_kvm_target_cpu() based percpu probe

kvm_target_cpu() never returns a negative error code, so check_kvm_target()
would never have 'ret' filled with a negative error code. Hence the percpu
probe via check_kvm_target_cpu() does not make sense as its never going to
find an unsupported CPU, forcing kvm_arch_init() to exit early. Hence lets
just drop this percpu probe (and also check_kvm_target_cpu()) altogether.

While here, this also changes kvm_target_cpu() return type to a u32, making
it explicit that an error code will not be returned from this function.

Cc: Marc Zyngier <[email protected]>
Cc: James Morse <[email protected]>
Cc: Alexandru Elisei <[email protected]>
Cc: Suzuki K Poulose <[email protected]>
Cc: Catalin Marinas <[email protected]>
Cc: Will Deacon <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Acked-by: Will Deacon <[email protected]>
Signed-off-by: Anshuman Khandual <[email protected]>
Signed-off-by: Marc Zyngier <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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