net: cosmetic: Change IPaddr_t to struct in_addr

This patch is simply clean-up to make the IPv4 type that is used match
what Linux uses. It also attempts to move all variables that are IP
addresses use good naming instead of CamelCase. No functional change.

Signed-off-by: Joe Hershberger <joe.hershberger@ni.com>
Acked-by: Simon Glass <sjg@chromium.org>

include/common.h

@@ -826,7 +826,7 @@ int zzip(void *dst, unsigned long *lenp, unsigned char *src,
 
 /* lib/net_utils.c */
 #include <net.h>
-static inline IPaddr_t getenv_IPaddr(char *var)
+static inline struct in_addr getenv_ip(char *var)
 {
 	return string_to_ip(getenv(var));
 }