ARM: ux500: Add nodes for the MSP into Device Tree

This patch inserts all known MSP devices into the DBx5x0 Device Tree
disabled and enables the two important ones for the Snowball low-cost
development board.

Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>