The ast2400 contains two and the ast2500 contains three watchdogs.
Add this information to the AspeedSoCInfo and realise the correct number
of watchdogs for that each SoC type.
Signed-off-by: NJoel Stanley <joel@jms.id.au>
Reviewed-by: NCédric Le Goater <clg@kaod.org>
Tested-by: NCédric Le Goater <clg@kaod.org>
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>