net: macb: drop wol modifications from upstream

The kernel applies the mainline commit ced4799d ("net: macb: mark device
wake capable when magic-packet property present") on the magic packet WOL
feature of macb. But in the SDK commit 3478668d ("net: macb: Add PM support"),
the magic packet WOL support is removed and using ARP WOL instead.

So drop the upstream patch from xlnx-soc branch.

Signed-off-by: Quanyang Wang <quanyang.wang@windriver.com>
Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>