ARM: dts: enable gpios and mpps selectively for pm8994

The current device tree enables all the gpios and mpps. However
not all of them are needed in platform. So disable all gpio and mpp
nodes in the PMIC specific file and only enable the ones used in
platform dtsi file.

Change-Id: Ic8c5b4fe795c6b7b86dd48711ec4ecb7f3c43048
Signed-off-by: Abhijeet Dharmapurikar <adharmap@codeaurora.org>