Revert "drivers/sensor: Convert formatter strings to use PRI defines"

This reverts commit e60af3be.

We revert this as we intent to move away from {u}int{8,16,32,64}_t types
to our own internal types for sized variables so we shouldn't need the
PRI macros anymore.

Change-Id: I4a57eb2c23cb1b137112224f604602d40c7cce4f
Signed-off-by: Kumar Gala <kumar.gala@linaro.org>