ARM: dts: msm: Enable tavil i2c mode on sdxpoorwills

Update pictrl to enable i2c communication with
tavil. Add ion memory device tree entry to
allocate shared memory for pcm communication
between apps and modem.

Change-Id: I6cd88e921be0d7a9fa1c331516f2e501424af737
Signed-off-by: Karthikeyan Mani <kmani@codeaurora.org>