Linux: enable the i210 add-on card

We will use it for its second SFP slot.

Change-Id: I140724f124a27c1c423d59e94aee048f16e29ef3
diff --git a/board/czechlight/clearfog/linux.fragment b/board/czechlight/clearfog/linux.fragment
index 20da4ee..f2249a3 100644
--- a/board/czechlight/clearfog/linux.fragment
+++ b/board/czechlight/clearfog/linux.fragment
@@ -27,6 +27,7 @@
 CONFIG_SPI_SPIDEV=y
 
 CONFIG_SFP=y
+CONFIG_IGB=y
 
 CONFIG_MACH_ARMADA_370=n
 CONFIG_MACH_ARMADA_375=n