sh_eth: enclose PM code into #ifdef CONFIG_PM
sh_eth: enclose PM code into #ifdef CONFIG_PM

Put '#ifdef CONFIG_PM' around sh_eth_runtime_nop() and 'sh_eth_dev_pm_ops'.
Add '#define SH_ETH_PM_OPS' to facilitate initialization of driver's 'pm' field
depending on whether CONFIG_PM is enabled.

Signed-off-by: Nobuhiro Iwamatsu <2b8440e189956f325e301c8d8c76bd30356b2f9f@renesas.com>
[Sergei: added the changelog, reworded the subject, changing the prefix.]
Signed-off-by: Sergei Shtylyov <d8c69075be49b0738b690ec4af0e9025b8c97c9e@cogentembedded.com>
Signed-off-by: David S. Miller <fe08d3c717adf2ae63592e4c9aec6e3e404d8e3e@davemloft.net>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs