board/BuR/common: increase NET_RETRY_COUNT to 10

Sometimes boards may need more time to become stable network connection
due to several reasons:

- phy speed
- link-partner (switch)

Therefore we increase the retry-count to 10 for making sure that network
connection works always.

Signed-off-by: Hannes Schmelzer <oe5hpm@oevsv.at>
Reviewed-by: Tom Rini <trini@konsulko.com>

include/configs/bur_cfg_common.h

@@ -33,7 +33,7 @@
 #define CONFIG_BOOTP_SEND_HOSTNAME
 #define CONFIG_BOOTP_GATEWAY
 #define CONFIG_BOOTP_SUBNETMASK
-#define CONFIG_NET_RETRY_COUNT		2
+#define CONFIG_NET_RETRY_COUNT		10
 
 /* Network console */
 #define CONFIG_NETCONSOLE		1