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/T1042D4RDB_defconfig b/configs/T1042D4RDB_defconfig
index 0b9ffae..621bc94 100644
--- a/configs/T1042D4RDB_defconfig
+++ b/configs/T1042D4RDB_defconfig
@@ -35,6 +35,8 @@
 CONFIG_CMD_GREPENV=y
 CONFIG_CMD_DM=y
 CONFIG_CMD_I2C=y
+CONFIG_LOADS_ECHO=y
+CONFIG_SYS_LOADS_BAUD_CHANGE=y
 CONFIG_CMD_MMC=y
 CONFIG_CMD_USB=y
 CONFIG_CMD_DHCP=y