bootstd: Use bootdev instead of bootdevice

It seems better to call this a 'bootdev' since this is name used in the
documentation. The older 'Bootdevice' name is no-longer used and may cause
confusion with the 'bootdevice' environment variable.

Update throughout to use bootdev.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/include/bootdev.h b/include/bootdev.h
index e72ef36..1533adf 100644
--- a/include/bootdev.h
+++ b/include/bootdev.h
@@ -200,7 +200,7 @@
  * All fields in @bflow must be set up. Note that @bflow->dev is used to add the
  * bootflow to that device.
  *
- * @dev: Bootdevice device to add to
+ * @dev: Bootdev device to add to
  * @bflow: Bootflow to add. Note that fields within bflow must be allocated
  *	since this function takes over ownership of these. This functions makes
  *	a copy of @bflow itself (without allocating its fields again), so the