spl: add support for alternative boot device

Introduce spl_boot_list array, which defines a list of boot devices
that SPL will try before hanging. By default this list will consist
of only spl_boot_device(), but board_boot_order() can be overridden
by board code to populate the array with custom values.

Signed-off-by: Nikita Kiryanov <[email protected]>
Cc: Igor Grinberg <[email protected]>
Cc: Tom Rini <[email protected]>
Cc: Simon Glass <[email protected]>
Reviewed-by: Tom Rini <[email protected]>
Reviewed-by: Simon Glass <[email protected]>

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