ARM: dts: mpq8092: Add krait regulator nodes

MPQ8092 runs from a ganged PMIC regulator. Create krait regulator
devices to control LDO/BHS mode and phases/voltage on the PMIC gang.

While at it also add the device for the gang regulator. This device
is responsible for implementing overshoot workarounds and also for
checking PMIC gang configuration.

Enable Krait regulator driver for mpq8092.

Change-Id: I28a993729adde16e350fbc7340a37e53439d9d20
Signed-off-by: Srinivas Ramana <sramana@codeaurora.org>
Signed-off-by: Anirudh Ghayal <aghayal@codeaurora.org>