net: stmmac: Add suspend resume support

Add support for low power features like suspend,
resume and wake on lan.

Change-Id: I161b1d6a00e2254cf6b855e81fab7ebd9be244d7
Acked-by: Nagarjuna Chaganti <nchagant@qti.qualcomm.com>
Signed-off-by: Suraj Jaiswal <jsuraj@codeaurora.org>