powerpc: p1022: add two functions for reset pci slot

[Scott Wood]

On Fri, Jan 22, 2016 at 04:19:07PM +0800, Dongsheng Wang wrote:
> +void p1022ds_reset_pcie_slot(void)
> +{
> +	if (px_ctl_altacc_flag)
> +		indirect_access_pixis_reset_pcie_slot();
> +	else
> +		direct_access_pixis_reset_pcie_slot();
> +}

This function is not called anywhere, and I don't see any dependent
patches that do so.

-Scott