stmmac: make platform drivers depend on their associated SoC

There's not much point, except compile test, enabling the stmmac
platform drivers unless their actual SoC is enabled. They're not
useful without it.

Signed-off-by: Peter Robinson <pbrobinson@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Peter Robinson 2016-06-01 13:28:58 +01:00 • committed by David S. Miller
commit 2e280c188f