Convert CONFIG_SYS_LOADS_BAUD_CHANGE et al to Kconfig

This converts the following to Kconfig:
   CONFIG_SYS_LOADS_BAUD_CHANGE
   CONFIG_LOADS_ECHO

As part of this, we move CMD_SAVES to be after CMD_LOADS as they are
logically related (load or save an s-record format file) and this makes
grouping of CONFIG_SYS_LOADS_BAUD_CHANGE easier.

Signed-off-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/configs/pg_wcom_expu1_update_defconfig b/configs/pg_wcom_expu1_update_defconfig
index 6c51d3d..cac91f8 100644
--- a/configs/pg_wcom_expu1_update_defconfig
+++ b/configs/pg_wcom_expu1_update_defconfig
@@ -50,6 +50,8 @@
 CONFIG_CMD_MEMTEST=y
 CONFIG_CMD_GPT=y
 CONFIG_CMD_I2C=y
+CONFIG_LOADS_ECHO=y
+CONFIG_SYS_LOADS_BAUD_CHANGE=y
 CONFIG_CMD_NAND=y
 CONFIG_CMD_NAND_TRIMFFS=y
 CONFIG_BOOTP_BOOTFILESIZE=y