Add the BMC firmware flash to the devicetree, so that it can be accessed from Linux. Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net> Link: https://lore.kernel.org/r/20221105185911.1547847-7-j.neuschaefer@gmx.net Signed-off-by: Joel Stanley <joel@jms.id.au>