net: cosmetic: Clean up ARP variables and functions

Make a thorough pass through all variables and function names contained
within arp and remove CamelCase and improve naming.

Signed-off-by: Joe Hershberger <joe.hershberger@ni.com>
Acked-by: Simon Glass <sjg@chromium.org>
diff --git a/net/ping.c b/net/ping.c
index 7c6084c..76e8749 100644
--- a/net/ping.c
+++ b/net/ping.c
@@ -56,12 +56,12 @@
 	set_icmp_header(pkt, net_ping_ip);
 
 	/* size of the waiting packet */
-	NetArpWaitTxPacketSize = eth_hdr_size + IP_ICMP_HDR_SIZE;
+	arp_wait_tx_packet_size = eth_hdr_size + IP_ICMP_HDR_SIZE;
 
 	/* and do the ARP request */
-	NetArpWaitTry = 1;
-	NetArpWaitTimerStart = get_timer(0);
-	ArpRequest();
+	arp_wait_try = 1;
+	arp_wait_timer_start = get_timer(0);
+	arp_request();
 	return 1;	/* waiting */
 }