smsc911x: Use pr_fmt, netdev_<level>, and netif_<level>

Use the more common/verbose logging styles.

Add #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
Remove smsc911x prefixes from format strings.
Rename SMSC_WARNING to SMSC_WARN.
Remove DPRINTK macro.
Use netif_<level> in SMSC_<level> macros.
Convert NETIF_MSG_<foo> uses to lower case.
Add no_printk verification in non-debug uses.
Add pdata to SMSC_<level> uses to avoid hidden variable uses.
Convert printks to netdev_<level> as appropriate.

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: David S. Miller <davem@davemloft.net>