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/env/mmc.c b/env/mmc.c
index 0338aa6..5fc0dae 100644
--- a/env/mmc.c
+++ b/env/mmc.c
@@ -239,7 +239,7 @@
 	mmc_set_env_part_restore(mmc);
 }
 
-#if defined(CONFIG_CMD_SAVEENV) && !defined(CONFIG_SPL_BUILD)
+#if defined(CONFIG_CMD_SAVEENV) && !defined(CONFIG_XPL_BUILD)
 static inline int write_env(struct mmc *mmc, unsigned long size,
 			    unsigned long offset, const void *buffer)
 {
@@ -368,7 +368,7 @@
 	fini_mmc_for_env(mmc);
 	return ret;
 }
-#endif /* CONFIG_CMD_SAVEENV && !CONFIG_SPL_BUILD */
+#endif /* CONFIG_CMD_SAVEENV && !CONFIG_XPL_BUILD */
 
 static inline int read_env(struct mmc *mmc, unsigned long size,
 			   unsigned long offset, const void *buffer)
@@ -498,7 +498,7 @@
 	.location	= ENVL_MMC,
 	ENV_NAME("MMC")
 	.load		= env_mmc_load,
-#if defined(CONFIG_CMD_SAVEENV) && !defined(CONFIG_SPL_BUILD)
+#if defined(CONFIG_CMD_SAVEENV) && !defined(CONFIG_XPL_BUILD)
 	.save		= env_save_ptr(env_mmc_save),
 	.erase		= ENV_ERASE_PTR(env_mmc_erase)
 #endif