ARM: dts: msm: Define thermal zone for PMI632 temperature sensor

Add thermal zone definition for pmi632_tz temperature sensor.

Change-Id: Ib3b8a6d7d87002fcc234d2c43cd1a47728d48c9c
Signed-off-by: Manaf Meethalavalappu Pallikunhi <manafm@codeaurora.org>