camera: Cleanup & remove compiler warnings

* Remove compiler warnings
* Use standard HAL API versions

Change-Id: I686c88e82a83072b9f392369960160e8ec345e30
camera: do not use GNU old-style field designators

Avoiding the use of GNU extensions improves portability

Change-Id: I2fd8ea9eebba75185533c4efed6cd6f4feeb0917