TI:am335x: Better comment and organize the networking related options

While in here, drop CONFIG_BOOTP_DEFAULT as it is unused in the code.

Signed-off-by: Tom Rini <trini@ti.com>
diff --git a/include/configs/ti_am335x_common.h b/include/configs/ti_am335x_common.h
index 0eae9c8..837c02c 100644
--- a/include/configs/ti_am335x_common.h
+++ b/include/configs/ti_am335x_common.h
@@ -28,18 +28,17 @@
 #define CONFIG_SYS_NS16550_CLK		48000000
 
 /* Network defines. */
-#define CONFIG_CMD_NET
+#define CONFIG_CMD_NET			/* 'bootp' and 'tftp' */
 #define CONFIG_CMD_DHCP
-#define CONFIG_CMD_PING
-#define CONFIG_DRIVER_TI_CPSW
-#define CONFIG_MII
-#define CONFIG_BOOTP_DEFAULT
-#define CONFIG_BOOTP_DNS
+#define CONFIG_BOOTP_DNS		/* Configurable parts of CMD_DHCP */
 #define CONFIG_BOOTP_DNS2
 #define CONFIG_BOOTP_SEND_HOSTNAME
 #define CONFIG_BOOTP_GATEWAY
 #define CONFIG_BOOTP_SUBNETMASK
 #define CONFIG_NET_RETRY_COUNT         10
+#define CONFIG_CMD_PING
+#define CONFIG_DRIVER_TI_CPSW		/* Driver for IP block */
+#define CONFIG_MII			/* Required in net/eth.c */
 
 /*
  * SPL related defines.  The Public RAM memory map the ROM defines the