Exclude generic camera implementation if TARGET_PROVIDES_CAMERA_HAL

Change-Id: I91066dfa3d271aa7f909fc8751adb74b622173d2
WIP: exynos: SEC_OMX_H264dec.c solve dump when decoding hd and fullhd h264

Trying to open a video in Movie Studio gives a FC if video was taken in resolution 1280x720 or 1900x1080.

I've tested it on my i9300. But don't know the impact on other devices.

Change-Id: Ic2c49b17341846127817391a30d3d78c0c49138e