accel/tcg: Replace target_ulong with vaddr in *_mmu_lookup()

Update atomic_mmu_lookup() and cpu_mmu_lookup() to take the guest
virtual address as a vaddr instead of a target_ulong.

Signed-off-by: Anton Johansson <anjo@rev.ng>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20230621135633.1649-10-anjo@rev.ng>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>