serial: xuartps: Add some register initialisation to cdns_early_console_setup()
Add initialisation of control register and baud rate to cdns_early_console_setup(), required when running kernel standalone without a boot loader. Baud rate is only initialised when specified in earlycon command-line option, otherwise it is assumed this has been set by a boot loader. Updated Documentation/kernel-parameters.txt accordingly. Signed-off-by: NScott Telford <stelford@cadence.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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