ARM: dts: msm: add dts entry for qpnp-vibrator

Add dts entry for qpnp-vibrator driver. qpnp-vibrator controls
the VIB_DRV_N pin on PMferrum, which is used for providing the
vibration effects for the device.

Change-Id: I14b22a0b36101dcbd112d2614e6a3dc4c4b13b32
Signed-off-by: Himanshu Aggarwal <haggarwa@codeaurora.org>