ARM: dts: msm: update GPIO keys pinctrl settings for MSMTITANIUM CDP/MTP

Configure the drive strength for the GPIO keys (vol+, camera focus,
camera snaphot) and also configure them as bias pull up.

Change-Id: Ic73ad27e9e6dcd73c2dce53a56f090642e04523d
Signed-off-by: Abinaya P <abinayap@codeaurora.org>