KVM: arm64: Remove redundant kvm_set_pfn_accessed() from user_mem_abort()

The function user_mem_abort() calls kvm_release_pfn_clean(),
which eventually calls kvm_set_page_accessed(). Therefore, remove
the redundant call to kvm_set_pfn_accessed().

Signed-off-by: Fuad Tabba <tabba@google.com>
Reviewed-by: Shaoqin Huang <shahuang@redhat.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20230731114110.2673451-1-tabba@google.com