bcm2835_property: implement "get board revision" query

bcm2835_property: implement "get board revision" query

Return a valid value from the BCM2835 property mailbox query "get board
revision". This query is used by U-Boot. Implementing it fixes the first
obvious difference between qemu and real HW.

The value returned is currently hard-coded to match the RPi2 I own. Other
values are legal, e.g. different board manufacturer field values are
likely to exist in the wild.

Cc: Andrew Baumann <[email protected]>
Signed-off-by: Stephen Warren <[email protected]>
Reviewed-by: Andrew Baumann <[email protected]>
Message-id: 1454993910[email protected]
Signed-off-by: Peter Maydell <[email protected]>