ARM: dts: msm: correctly disable home key for SDM632 RCM

Correctly disable home key for SDM632 RCM devices, instead
of disabling it from SDM632 CDP files. SDM632 CDP has home
key connected to gpio88, so it needs home key to be remained
as enabled.

Change-Id: I4c744a4410034b81a3facaf906db02e4cdd4ae37
Signed-off-by: Shantanu Jain <shjain@codeaurora.org>