net: Move sungem_phy.h under include/linux

Fixes build failures of the spider_net driver because it tries
to use a convoluted path to include this header.

Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/ethernet/sun/sungem.c b/drivers/net/ethernet/sun/sungem.c
index ade35dd..0f13c5d 100644
--- a/drivers/net/ethernet/sun/sungem.c
+++ b/drivers/net/ethernet/sun/sungem.c
@@ -59,7 +59,7 @@
 #include <asm/pmac_feature.h>
 #endif
 
-#include "sungem_phy.h"
+#include <linux/sungem_phy.h>
 #include "sungem.h"
 
 /* Stripping FCS is causing problems, disabled for now */