x86: crownbay: Enable Intel Topcliff GMAC support

Intel Crown Bay board has one ethernet port connected from Intel
Topcliff PCH. Enable it in the board configuration.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Joe Hershberger <joe.hershberger@ni.com>

include/configs/crownbay.h

@@ -52,6 +52,10 @@
 #define CONFIG_MMC_SDMA
 #define CONFIG_CMD_MMC
 
+/* Topcliff Gigabit Ethernet */
+#define CONFIG_PCH_GBE
+#define CONFIG_PHYLIB
+
 /* Video is not supported */
 #undef CONFIG_VIDEO
 #undef CONFIG_CFB_CONSOLE