kvm-arm: Remove kvm_pud_huge()

Get rid of kvm_pud_huge() which falls back to pud_huge. Use
pud_huge instead.

Acked-by: Christoffer Dall <christoffer.dall@linaro.org>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>