By specifying the silicon revision we select the appropriate reset
values for the SoC.

Additionally, expose hardware strapping properties aliasing those
provided by the SCU for board-specific configuration.
Signed-off-by: NAndrew Jeffery <andrew@aj.id.au>
Reviewed-by: NCédric Le Goater <clg@kaod.org>
Reviewed-by: NPeter Maydell <peter.maydell@linaro.org>
Message-id: 1466744305-23163-3-git-send-email-andrew@aj.id.au
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>