Enable pmem_adsp allocator for msm camera

Change-Id: I51fbe2f1e751fb74ab48f4f2947b8d1767c0a41f
camera: do not allocate client_for_ion when ION is disabled
gemini: do not use ION in gemini driver

The proprietary libgemini.so we have does not support ION memory allocation
so until we will have a newer libgemini.so we need to disable the ION support
in gemini driver.