This enables the use of the auxiliary spi1 and spi2 devices
on the bcm2835 SOC.

Note that this requires the use of the new clk-bcm2835-aux to work.
Signed-off-by: NMartin Sperl <kernel@martin.sperl.org>
Acked-by: NStephen Warren <swarren@wwwdotorg.org>
[anholt: Rebased on 2835.dtsi -> 283x.dtsi change]
Signed-off-by: NEric Anholt <eric@anholt.net>