"fw-init-baudrate" is missing a type, add it. While we're here, define the
default value with a schema rather than freeform text.
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20230613200929.2822137-1-robh@kernel.orgSigned-off-by: Rob Herring <robh@kernel.org>