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/gazerbeam_defconfig b/configs/gazerbeam_defconfig
index c344a6c..8646bee 100644
--- a/configs/gazerbeam_defconfig
+++ b/configs/gazerbeam_defconfig
@@ -140,6 +140,8 @@
 CONFIG_SYS_ALT_MEMTEST=y
 CONFIG_CMD_GPIO=y
 CONFIG_CMD_I2C=y
+CONFIG_LOADS_ECHO=y
+CONFIG_SYS_LOADS_BAUD_CHANGE=y
 CONFIG_CMD_MMC=y
 CONFIG_CMD_AXI=y
 # CONFIG_CMD_SETEXPR is not set