global: Use CONFIG_XPL_BUILD instead of CONFIG_SPL_BUILD

Complete this rename for all directories outside arch/ board/ drivers/
and include/

Use the new symbol to refer to any 'SPL' build, including TPL and VPL

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/net/net.c b/net/net.c
index 1e0b7c8..fd7d413 100644
--- a/net/net.c
+++ b/net/net.c
@@ -305,7 +305,7 @@
  */
 void net_auto_load(void)
 {
-#if defined(CONFIG_CMD_NFS) && !defined(CONFIG_SPL_BUILD)
+#if defined(CONFIG_CMD_NFS) && !defined(CONFIG_XPL_BUILD)
 	const char *s = env_get("autoload");
 
 	if (s != NULL && strcmp(s, "NFS") == 0) {
@@ -559,7 +559,7 @@
 			ping6_start();
 			break;
 #endif
-#if defined(CONFIG_CMD_NFS) && !defined(CONFIG_SPL_BUILD)
+#if defined(CONFIG_CMD_NFS) && !defined(CONFIG_XPL_BUILD)
 		case NFS:
 			nfs_start();
 			break;
@@ -574,7 +574,7 @@
 			cdp_start();
 			break;
 #endif
-#if defined(CONFIG_NETCONSOLE) && !defined(CONFIG_SPL_BUILD)
+#if defined(CONFIG_NETCONSOLE) && !defined(CONFIG_XPL_BUILD)
 		case NETCONS:
 			nc_start();
 			break;
@@ -1439,7 +1439,7 @@
 			}
 		}
 
-#if defined(CONFIG_NETCONSOLE) && !defined(CONFIG_SPL_BUILD)
+#if defined(CONFIG_NETCONSOLE) && !defined(CONFIG_XPL_BUILD)
 		nc_input_packet((uchar *)ip + IP_UDP_HDR_SIZE,
 				src_ip,
 				ntohs(ip->udp_dst),