ARM: dts: msm: Correct spi2 chip select configuration for msm8909

Configure chip select gpio for spi2 to be pull-up,
otherwise chip select line stays low all the time
and spi transactions return incorrect data.

Change-Id: I64608c8078561e8a5e2797685b9c3b5875fba385
Signed-off-by: Siva Yarravarapu <sivay@codeaurora.org>