msm: camera_v2: cpp: Fix data types in cpp structures

Data types should have to be well defined. Otherwise conflicts
and problems can occure when code is compiled for different
platforms and toolchains.

Signed-off-by: Iliya Varadzhakov <ivarad@codeaurora.org>
Change-Id: I508fddedb7df02a39770c2e30ef19b6800938360