imx: ventana: add appropriate delay following GSC i2c write

The Gateworks System Controller EEPROM config is flash based. Add a delay
following writes to avoid errors on back-to-back writes.

Signed-off-by: Tim Harvey <tharvey@gateworks.com>
diff --git a/board/gateworks/gw_ventana/gsc.c b/board/gateworks/gw_ventana/gsc.c
index 37966ab..1cf38d4 100644
--- a/board/gateworks/gw_ventana/gsc.c
+++ b/board/gateworks/gw_ventana/gsc.c
@@ -57,7 +57,7 @@
 			break;
 		mdelay(10);
 	}
-	mdelay(1);
+	mdelay(100);
 	return ret;
 }