ARM: dts: msm: Update camera GPIO, VREG config for msmfalcon interposer

1. Update PMIC gpio configuration for
   front and rear camera.
2. Correct VANA GPIO.
3. Correct the CSID VREG Voting.

Change-Id: I1e72bf8855ea1150eb2cedaee82d04610b09bdae
Signed-off-by: Shankar Ravi <rshankar@codeaurora.org>