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The current 'doing_global' refers to being in the state of processing global bootmeths. Since global bootmeths are currently used once at the start, it becomes false once the last global bootmeth has been used. In preparation for allowing bootmeths to run at other points in the bootstd interation, add a new 'have_global' flag which tracks whether there are any global bootmeths in the method_order[] list. It is set up when iteration starts. Unlike doing_global which resets back to false after the global bootmeths have been handled, once have_global is set to true, it remains true for the entire iteration process. This provides a quick check as to whether global-bootmeth processing is needed. Signed-off-by: Simon Glass <sjg@chromium.org>