staging: et131x: Remove duplicated register defines from et1310_phy.h

The VMI_* set of register defines are not used, and duplicate the set of PHY_* registers from the same file, which are used - hence removing.

Signed-off-by: Mark Einon <mark.einon@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>