ARM: dts: msm: correct gpio for volume plus key for MSM8909W BG V2

Correct gpio for volume plus key for suspend state for MSM8909W BG
V2 target.

Change-Id: I1b60bc17a4f62aa2baade2e7c4f53bbd6b158482
Signed-off-by: Shantanu Jain <shjain@codeaurora.org>