msm: emac: Improve wake-on-lan interrupt handler

AT803x is a single port external phy, whereas QCA8337
is a multi port external phy, so differentiate the AT803x
interrupt handling from QCA8337.

Change-Id: I8b833ad4b4466a7c6154b48a87db8542e3479ba4
Signed-off-by: Dilip Kota <dkota@codeaurora.org>